Ice Retention / The rankings
The best ice packs for coolers: what Outdoor Life measured, and which ones carry a warranty
Every ice pack in Outdoor Life's test warmed past 28°F within four hours on a counter. Inside a cooler under real ice they last days. Six ranked on the measured start, the four-hour reading, the term and the price.
By Mike M.Updated Researched · every figure sourced
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Top pick · Best Ice Pack
YETI ICE Sheet (Large)
The coldest start in Outdoor Life's test (-5°F) and 28°F after 4 hours, in a hard shell you can stack cans on.
#ad · Price as of November 5, 2026 · Disclosure for the link to YETI ICE Sheet (Large)
Quick picks
The rankings at a glance
| # | Product | Best for | Score | Price |
|---|---|---|---|---|
| 1 | YETI ICE Sheet (Large) The coldest start in Outdoor Life's test (-5°F) and 28°F after 4 hours, in a hard shell you can stack cans on. YETI now sells this as the ICE Sheet rather than THIN ICE, and its own listing describes it as THIN ICE's successor at nearly 50% slimmer. YETI ICE carries the 5-year term. | Coldest start, 5-year term5-yr warranty | 9.6 /10 | $25.00YETI ICE Sheet (Large) on Amazon |
| 2 |  Igloo MaxCold Ice Block (Large, 2-pack) Outdoor Life's Best Overall ice pack: 5°F out of the freezer, 31°F after 4 hours on a counter. Ultratherm gel blocks in the Large size, now sold two to a pack, with a 90-day term. | Outdoor Life's Best Overall90-day warranty | 9.5 /10 | $14.99Igloo MaxCold Ice Block (Large, 2-pack) on Amazon |
| 3 |  Engel 5 lb Reusable Ice Pack (32°F) A phase-change pack that holds at 32°F instead of freezing your food, with a limited lifetime warranty printed on the product page - the pick when you want drinks cold without the lettuce going solid. | Best 32°F pack, lifetime termLifetime warranty | 9.5 /10 | $29.99Engel 5 lb Reusable Ice Pack (32°F) on Amazon |
| 4 |  Cooler Shock Mid-Size Reusable Ice Packs (4-pack) The coldest pack in Outdoor Life's test at 4°F out of the freezer and 30°F after 4 hours. An 18°F phase-change fill you add water to once and freeze forever, now sold four to a pack; the maker's site redirects to Amazon, so the warranty is unverified. | Outdoor Life's ColdestWarranty: unverified | 9.4 /10 | $29.99Cooler Shock Mid-Size Reusable Ice Packs (4-pack) on Amazon |
| 5 |  Arctic Zone Gel Ice Pack (2-pack, 250 g) Two 250 g gel packs under Arctic Zone's limited lifetime warranty, sized for a lunch bag rather than a cooler floor. No third-party test we could cite; the page carries a frostbite warning, which tells you they freeze hard. | Cheapest lifetime termLifetime warranty | 9.4 /10 | $13.99Arctic Zone Gel Ice Pack (2-pack, 250 g) on Amazon |
| 6 |  RTIC Ice Pack Small (2-pack) 1°F out of the freezer but 37°F after 4 hours in Outdoor Life's test: cold, then not. Fine for a lunch box; 90-day term. | Lunch-box size90-day warranty | 9.1 /10 | $19.99RTIC Ice Pack Small (2-pack) on Amazon |
#ad · Prices come live from Amazon, last checked November 5, 2026. Scores are ours, built from published specs, quoted warranty terms and cited third-party ice-retention tests, not our own measurements. Product photos come from Amazon. Tap a row for the full write-up.
What Outdoor Life measured
Outdoor Life, June 12, 2025, Laura Lancaster: “After freezing the ice packs for over thirty-six hours, I took them out and placed them on the counter to measure their initial temperature using an infrared thermometer,” then again at four hours. Results: Igloo MaxCold Ice Block 5°F start, 31°F at four hours (Best Overall). Cooler Shock 4°F, 30°F (Coldest). Arctic Chillin' Brew -2°F, 30°F. YETI ICE Sheet (Large) -5°F, 28°F. Bass Pro Cool Pack 3°F, 29°F. Igloo Performance Ice 11°F, 31°F. RTIC Ice Pack Small 1°F, 37°F. Oyster 6°F, 30°F. Cool Coolers 1°F, 48°F. Igloo Natural Ice 3°F, 61°F. Bass Pro Freeze Pack 5°F, 57°F. A bag of ice: 32°F, 32°F. That is one protocol on an open counter, which is the harshest possible condition; it separates packs that are built to hold cold from packs that are built to be blue.
Side by side
| Evidence | YETI ICE Sheet (Large) | Igloo MaxCold Ice Block (Large, 2-pack) | Cooler Shock Mid-Size Reusable Ice Packs (4-pack) | RTIC Ice Pack Small (2-pack) |
|---|---|---|---|---|
| Ice retention (reported) | -5°F start, 28°F after 4 hours (Outdoor Life, tested as THIN ICE) | 5°F start, 31°F after 4 hours on a counter following a 36-hour freeze (Outdoor Life, Best Overall) | 4°F start, 30°F after 4 hours (Outdoor Life, 'Coldest') | 1°F start, 37°F after 4 hours (Outdoor Life) |
| Material | — | 'Non-toxic Ultratherm gel delivers extended cooling performance'; reusable freezable gel block | Nylon-reinforced pouches you fill with water using the included funnel, then freeze; 'Replaces 5-6 lbs of Ice Per Pack' | — |
| Weight | 2.2 lb | 2.03 lb for the two-pack | — | — |
| Warranty | 5-year limited (YETI ICE) | 90 days (Igloo ice substitutes) | Unverified: coolershock.com redirects to an Amazon storefront; no warranty page found | 90 days (RTIC Gear & Accessories) |
| Score | 9.6/10 | 9.5/10 | 9.4/10 | 9.1/10 |
| Evidence | Engel 5 lb Reusable Ice Pack (32°F) | Arctic Zone Gel Ice Pack (2-pack, 250 g) |
|---|---|---|
| Phase change | 2.5 lb and 5 lb packs: 32°F; 0.75 lb pack: 28°F | — |
| Ice retention (reported) | Unverified: no third-party test found as of 2026-09-21 | Unverified: no third-party test found as of 2026-10-03 |
| Exterior | XL 11 × 8.75 × 2 in; L 9.5 × 7.5 × 1.25 in; S 6.3 × 4.25 × 1.25 in | 7 × 6.75 × 2 in for the pair as shipped |
| Material | — | Non-toxic gel in a puncture-resistant soft pack; 'Do not freeze if pack is punctured'; frostbite warning on handling |
| Warranty | Limited lifetime (stated on the Cooler Packs product page) | Limited lifetime (Arctic Zone) |
| Score | 9.5/10 | 9.4/10 |
Packs vs ice
If the plan is packs instead of ice entirely, the method matters as much as the pack: how to keep drinks cold without ice covers the pre-chill, the freezing point to choose, and why a half-empty cooler with packs in it performs worse than a full smaller one.
Phase-change packs are a separate case. Engel's 2.5 lb and 5 lb packs are formulated to hold at 32°F rather than freeze as cold as possible; the 0.75 lb pack holds at 28°F. That is the pack for a cooler of produce or a lunch bag, where a -5°F YETI block would freeze the lettuce. It is not the pack for keeping meat frozen. Engel prints a limited lifetime warranty on that product page, the longest term of any pack here.
On terms, the packs split like the coolers: YETI ICE is in YETI's five-year group; Engel and Arctic Zone print lifetime; Igloo gives ice substitutes 90 days; RTIC gives gear and accessories 90 days. For an $8 block, 90 days is fine. For a $25 hard-shell YETI, the 5 years is part of the price.
Once you have picked a pack, the next question is how many — and it is arithmetic rather than a rule of thumb. How many ice packs do I need divides your cooler's published ice capacity by the ice each pack claims to replace.
In detail
The picks, in full
Rank 1
Coldest start, 5-year term
YETI ICE Sheet (Large)
The coldest start in Outdoor Life's test (-5°F) and 28°F after 4 hours, in a hard shell you can stack cans on. YETI now sells this as the ICE Sheet rather than THIN ICE, and its own listing describes it as THIN ICE's successor at nearly 50% slimmer. YETI ICE carries the 5-year term.
Spec sheetResearched · every figure sourced
| Category | Ice pack |
|---|---|
| Warranty (quoted) | 5-year limited (YETI ICE) |
| Wear parts | Not applicable. |
| Ice retention (reported) | -5°F start, 28°F after 4 hours (Outdoor Life, tested as THIN ICE) |
| Construction | 'nearly 50% slimmer than its predecessor and engineered to completely replace the need for regular ice inside your Hopper Soft Coolers and Daytrip Lunch Bag and Box'; impact-resistant shell, custom shape for faster freezing |
| Weight | 2.2 lb |
How the 9.6 breaks down
- Performance (reported) (35%)
- 10.0
- Durability & warranty (25%)
- 9.8
- Fit & compatibility (20%)
- 9.3
- Value (20%)
- 9.0
Why we picked it
- Lowest temperature out of the freezer in the test
- Hard shell; no punctures, no gel leaks
- 5-year term on an ice pack
Good to know
- The most expensive single pack here
- Hard shells take cooler space
- Works best alongside ice, not instead of it
Skip this if…
…you need to cover a cooler floor cheaply; a Cooler Shock four-pack covers more for less.
#ad · Price as of November 5, 2026 · Disclosure for the link to YETI ICE Sheet (Large)
Rank 2
Outdoor Life's Best Overall
Igloo MaxCold Ice Block (Large, 2-pack)
Outdoor Life's Best Overall ice pack: 5°F out of the freezer, 31°F after 4 hours on a counter. Ultratherm gel blocks in the Large size, now sold two to a pack, with a 90-day term.
Spec sheetResearched · every figure sourced
| Category | Ice pack |
|---|---|
| Warranty (quoted) | 90 days (Igloo ice substitutes) |
| Wear parts | Not applicable. |
| Ice retention (reported) | 5°F start, 31°F after 4 hours on a counter following a 36-hour freeze (Outdoor Life, Best Overall) |
| Material | 'Non-toxic Ultratherm gel delivers extended cooling performance'; reusable freezable gel block |
| Exterior | 8.75 × 5.67 × 1.38 in per block |
| Weight | 2.03 lb for the two-pack |
How the 9.5 breaks down
- Performance (reported) (35%)
- 9.8
- Durability & warranty (25%)
- 8.8
- Fit & compatibility (20%)
- 9.5
- Value (20%)
- 10.0
Why we picked it
- Won Outdoor Life's test at the lowest price in it
- Flat blocks lie under a layer of ice without stealing much space
- Sold in Small, Medium and Large, and now two Large blocks per pack
Good to know
- 90-day term
- Gel blocks crack if dropped frozen
- Not a phase-change pack; it warms like ice does
Skip this if…
…you want a pack that stays at 32°F on purpose (Engel) or freezes colder for longer (the YETI ICE Sheet).
#ad · Price as of November 5, 2026 · Disclosure for the link to Igloo MaxCold Ice Block (Large, 2-pack)
Rank 3
Best 32°F pack, lifetime term
Engel 5 lb Reusable Ice Pack (32°F)
A phase-change pack that holds at 32°F instead of freezing your food, with a limited lifetime warranty printed on the product page - the pick when you want drinks cold without the lettuce going solid.
Spec sheetResearched · every figure sourced
| Category | Ice pack |
|---|---|
| Warranty (quoted) | Limited lifetime (stated on the Cooler Packs product page) |
| Wear parts | Not applicable. |
| Ice retention (reported) | Unverified: no third-party test found as of 2026-09-21 |
| Exterior | XL 11 × 8.75 × 2 in; L 9.5 × 7.5 × 1.25 in; S 6.3 × 4.25 × 1.25 in |
| Phase change | 2.5 lb and 5 lb packs: 32°F; 0.75 lb pack: 28°F |
How the 9.5 breaks down
- Performance (reported) (35%)
- 9.3
- Durability & warranty (25%)
- 9.8
- Fit & compatibility (20%)
- 9.5
- Value (20%)
- 9.5
Why we picked it
- Holds at 32°F: refrigerator-safe without freezing produce
- Lifetime term
- Made in the USA, per the listing
Good to know
- No measured figure we could cite
- Two inches thick in XL
- Phase-change packs warm faster than a colder gel once they change
Skip this if…
…you want the coldest pack; a 32°F pack is designed not to be.
#ad · Price as of November 5, 2026 · Disclosure for the link to Engel 5 lb Reusable Ice Pack (32°F)
Rank 4
Outdoor Life's Coldest
Cooler Shock Mid-Size Reusable Ice Packs (4-pack)
The coldest pack in Outdoor Life's test at 4°F out of the freezer and 30°F after 4 hours. An 18°F phase-change fill you add water to once and freeze forever, now sold four to a pack; the maker's site redirects to Amazon, so the warranty is unverified.
Spec sheetResearched · every figure sourced
| Category | Ice pack |
|---|---|
| Warranty (quoted) | Unverified: coolershock.com redirects to an Amazon storefront; no warranty page found |
| Wear parts | Not applicable. |
| Ice retention (reported) | 4°F start, 30°F after 4 hours (Outdoor Life, 'Coldest') |
| Material | Nylon-reinforced pouches you fill with water using the included funnel, then freeze; 'Replaces 5-6 lbs of Ice Per Pack' |
| Exterior | 10 × 10 × 1 in per pack |
| Phase change | 'An 18°F phase change point keeps contents colder longer than standard ice, maintaining safe temps for up to 48 hours in a size-matched cooler' |
How the 9.4 breaks down
- Performance (reported) (35%)
- 9.8
- Durability & warranty (25%)
- 9.0
- Fit & compatibility (20%)
- 9.5
- Value (20%)
- 9.3
Why we picked it
- Coldest measured start temperature in the test
- Four flat packs cover a cooler floor
- Ship dry: you add the water once and refreeze forever
Good to know
- No manufacturer page we could read
- Warranty unknown
- You have to measure your cooler: 10 × 10 in is not small
Skip this if…
…you want a warranty term you can read.
#ad · Price as of November 5, 2026 · Disclosure for the link to Cooler Shock Mid-Size Reusable Ice Packs (4-pack)
Rank 5
Cheapest lifetime term
Arctic Zone Gel Ice Pack (2-pack, 250 g)
Two 250 g gel packs under Arctic Zone's limited lifetime warranty, sized for a lunch bag rather than a cooler floor. No third-party test we could cite; the page carries a frostbite warning, which tells you they freeze hard.
Spec sheetResearched · every figure sourced
| Category | Ice pack |
|---|---|
| Warranty (quoted) | Limited lifetime (Arctic Zone) |
| Wear parts | Not applicable. |
| Ice retention (reported) | Unverified: no third-party test found as of 2026-10-03 |
| Material | Non-toxic gel in a puncture-resistant soft pack; 'Do not freeze if pack is punctured'; frostbite warning on handling |
| Exterior | 7 × 6.75 × 2 in for the pair as shipped |
| Fits | 'sized to fit lunch bags, coolers and insulated totes'; 250 g each |
How the 9.4 breaks down
- Performance (reported) (35%)
- 9.0
- Durability & warranty (25%)
- 9.5
- Fit & compatibility (20%)
- 9.5
- Value (20%)
- 9.8
Why we picked it
- Lifetime term
- Cheapest pack on this list
- Sized for lunch coolers and small soft coolers
Good to know
- No measured figure
- Gel; punctures end it
- 250 g each: this is a lunch-bag pack, not a cooler-floor block
Skip this if…
…you need a floor-covering block for a hard cooler.
#ad · Price as of November 5, 2026 · Disclosure for the link to Arctic Zone Gel Ice Pack (2-pack, 250 g)
Rank 6
Lunch-box size
RTIC Ice Pack Small (2-pack)
1°F out of the freezer but 37°F after 4 hours in Outdoor Life's test: cold, then not. Fine for a lunch box; 90-day term.
Spec sheetResearched · every figure sourced
| Category | Ice pack |
|---|---|
| Warranty (quoted) | 90 days (RTIC Gear & Accessories) |
| Wear parts | Not applicable. |
| Ice retention (reported) | 1°F start, 37°F after 4 hours (Outdoor Life) |
How the 9.1 breaks down
- Performance (reported) (35%)
- 9.0
- Durability & warranty (25%)
- 8.8
- Fit & compatibility (20%)
- 9.5
- Value (20%)
- 9.3
Why we picked it
- Very cold start
- Small format for lunch coolers
- Two in the pack
Good to know
- Warmed past 32°F within 4 hours in the test
- 90-day term
- Break-resistant, but still a gel pouch
Skip this if…
…it has to last past lunch.
#ad · Price as of November 5, 2026 · Disclosure for the link to RTIC Ice Pack Small (2-pack)
Buyer's guide: packs that earn their space
Hard shell for a hard cooler
Gel packs puncture under a case of cans; a hard shell (YETI, Igloo block) does not. Soft gel packs belong in lunch bags.
Cover the floor
Two large blocks cover most 45-quart floors. Packs supplement ice, so buy floor coverage, not volume.
32°F for produce, -5°F for meat
Engel's phase-change packs for the lettuce cooler; YETI ICE Sheet or Cooler Shock for the meat cooler.
Freeze them 36 hours
Outdoor Life froze for over 36 hours before testing. A pack frozen overnight is not at its floor temperature.
Pre-chill with them
They go in the night before and stay in for the trip. How to pre-chill a cooler.
In one line
Our recommendation
Our pick · Best Ice Pack
YETI ICE Sheet (Large)
9.6 /10The coldest start in Outdoor Life's test (-5°F) and 28°F after 4 hours, in a hard shell you can stack cans on. YETI now sells this as the ICE Sheet rather than THIN ICE, and its own listing describes it as THIN ICE's successor at nearly 50% slimmer. YETI ICE carries the 5-year term.
$25.00YETI ICE Sheet (Large) on Amazon#ad · Price as of November 5, 2026 · Disclosure for the link to YETI ICE Sheet (Large)
Runner-up
Igloo MaxCold Ice Block (Large, 2-pack)
9.5 /10Outdoor Life's Best Overall ice pack: 5°F out of the freezer, 31°F after 4 hours on a counter. Ultratherm gel blocks in the Large size, now sold two to a pack, with a 90-day term.
$14.99Igloo MaxCold Ice Block (Large, 2-pack) on Amazon#ad · Price as of November 5, 2026 · Disclosure for the link to Igloo MaxCold Ice Block (Large, 2-pack)
How we scored this
What we checked before picking
Every pick on this page is built from documents you can open yourself: the maker's published capacity, insulation, dimensions and weight; the warranty term quoted from the maker's own warranty page with the date we read it; the parts catalogue, to confirm the latches, gaskets, plugs, lids and straws can actually be bought; and the third-party ice-retention tests that measured these models (OutdoorGearLab, Outdoor Life, Treeline, Outside, Gear Patrol), credited to the publisher that ran them. Every figure links to where it came from, so you can check the pick before you buy it.
Scores run from 8.4 to 10: 9.5–9.8 is category-defining, 9.0–9.4 outstanding, and 8.4–8.9 excellent and strongly recommended. Nothing below 8.4 is listed here — a product that cannot earn 8.4 on the rubric gets replaced by a stronger one rather than published with a weak number.
Scores are editorial judgments built from that documented research. Commissions never set a score or decide a pick. The rubric and its weights are published.
Corrections & updates
- First published with Outdoor Life's June 12, 2025 figures.
Questions
Frequently asked
What is the best ice pack for a cooler?
Outdoor Life's Best Overall is the Igloo MaxCold Ice Block (Large, 2-pack) (5°F start, 31°F at four hours, $8). The YETI ICE Sheet had the coldest start (-5°F) and carries a 5-year term. Cooler Shock was the coldest at four hours (30°F).
How many ice packs do you need for a cooler?
Enough to cover the floor, then ice on top. Packs supplement ice; in Outdoor Life's test every pack warmed past 28°F within four hours in open air.
Are ice packs better than ice?
Colder to start and mess-free, but they run out of cooling faster than melting ice, which sits at 32°F until it is gone. Use both: packs on the bottom, ice on top.
What ice pack lasts the longest?
In open air, the YETI ICE Sheet (28°F at four hours) and Cooler Shock (30°F) held lowest in Outdoor Life's test. In a cooler under ice, any hard pack lasts days.
Where do these numbers come from?
Measurements are Outdoor Life's; terms are quoted from the makers.
Keep reading
Related on Chill & Chest
- Block ice vs cubed iceWhere a sealed pack beats real ice.
- How to keep ice longerWhere the packs go in the stack.
- How to pre-chill a coolerPacks the night before.
- Best lunch coolersWhere a small gel pack belongs.
- Best soft coolersPacks instead of loose ice in a fabric-zipper bag.
- Dry ice in a coolerFor frozen food, the other tool.
Receipts
Sources
- Outdoor Life — "Best Ice Packs for Coolers", June 12, 2025, 36-hour freeze test (read 2026-09-21)
- Igloo — MaxCold Ice Large Freeze Block product page (read 2026-09-21)
- Igloo — Warranty Policy (read 2026-09-21)
- Engel — Cooler Packs 32°F & 28°F product page (read 2026-09-21)
- Arctic Zone — Set of 2 High Performance Ice Packs product page (read 2026-09-21)
- Arctic Zone / Titan — Warranty page (read 2026-09-21)
- YETI — Warranty Information (YETI's warranty page as republished by Acme Tools, an authorized YETI dealer; read 2026-09-21)
- RTIC — Warranty page (read 2026-09-21)
Specs come from the maker's own product pages (linked on every product), warranty terms from the maker's warranty page with the date we read it, and ice-retention measurements are attributed to whoever measured them. Prices are the live Amazon price with the date they were last checked. Where a figure isn't published anywhere, the page says so. Read the full method.