Cooler Shock logoCOOLER SHOCK

Cooler Shock ice packs — colder than ice, without the puddle

We make reusable ice packs that freeze to 18°F, fourteen degrees colder than the ice they replace. Fill a Cooler Shock pack once, freeze it, and it keeps food and drinks cold for 24 to 48 hours — then it goes back on the freezer shelf instead of down the drain.

Screw-Top Ice Packs, Mid-Size 10" x 10", 4 Pack · $29.99 · 4.6★ from 12,142 ratings

Hard Case Ice Packs by Cooler ShockHard Case Ice PacksRigid 13" x 10" shells that stack like bricks and shrug off a slammed lid.Screw-Top Ice Packs by Cooler ShockScrew-Top Ice PacksFill once with the funnel, cap it for life, freeze it for years of trips.Lunch Box Ice Packs by Cooler ShockLunch Box Ice PacksSlim packs and prefilled gel for the bag that goes to work and school.

Cooler Shock favorites: cold that goes the whole weekend

From a two-night camp to a daily lunch run, these are the packs our owners reorder most. Each one was engineered to beat the melt and land in the cooler you already own.

Not sure how many packs your cooler needs? Read the cooler-size chart →

How many Cooler Shock packs fill your cooler

One of our 13" x 10" hard packs does the work of a 7 lb bag of ice. Match the count to your cooler and the floor stays dry.

Cooler sizeCooler Shock hard packs
16 quartup to 2 hard packs
32 quartup to 3 hard packs
48 quartup to 4 hard packs
64–80 quartup to 5 hard packs
96 quartup to 10 hard packs

1 hard pack = 7 lb bag of ice

Cooler Shock 13 by 10 inch hard ice pack size

Why owners switch to Cooler Shock

18°F, not 32°F

Our cooling mix freezes and holds at 18°F (-8°C). The pack starts colder than ice and stays colder through the day, so perishables stay safely chilled for extended periods.

Fill once, reuse for years

Water goes in one time. After that a pack cycles freezer to cooler and back, season after season — no more buying bags of ice before every trip, which quietly saves money.

Durable and leak-resistant

Nylon-reinforced pouches and HDPE shells with screw caps hold their seal through repeated freezing and thawing, so the bottom of the cooler stays dry.

A shape for every cooler

Ten sizes, from a 6.5" lunch pack to a 15.8" pouch with a handle. Versatile enough for a beach cooler, a fish bag or a diaper bag.

Flat in the freezer

Packs lie flat on a freezer shelf and flat in the cooler. They take less room than loose ice, leaving more space for food and drinks.

Food-safe inside

Non-hazardous, food-safe mix and BPA-free gel. Pack them right against the sandwiches — nothing to keep away from the kids' lunch.

Three steps from freezer shelf to cooler lid

1

Fill it once

Screw-top and hard case packs ship dry with our cooling mix inside. Measure the water on the box, pour it through the funnel, shake, and cap it. That is the only time you will ever fill it.

Fill it once — Cooler Shock ice pack step 1
2

Freeze it flat

Give the first freeze a full 24 hours, longer for hard cases. Lay packs flat or drape a pouch over a bottle if you want it to set curved around a dish.

Freeze it flat — Cooler Shock ice pack step 2
3

Pack it and go

One pack on the floor, one against the wall, one across the top. Cold sinks, so the top pack does more than you think. Back in the freezer when you get home.

Pack it and go — Cooler Shock ice pack step 3

About Cooler Shock

friends with cooler of cold drinkskids lunch bag with cooler shock ice packno melted mess ice pack with canschills faster than ice freezer packs

We started Cooler Shock with a simple complaint: ice melts, and it always melts at the worst moment. The founding idea was a reusable cold pack that lasts longer than bagged ice, performs better than standard gel packs, and leaves no water in the bottom of the cooler.

At the heart of every pack is our own cooling formula. It freezes at 18°F, below the freezing point of water, so the cold it gives off is sharper and lasts longer. We pair that formula with simple, durable shells: reinforced pouches with screw caps, rigid hard cases, and prefilled gel packs for lunch boxes.

Our customers take them fishing, to the beach, on road trips and into twelve-hour shifts. Wherever the cooler goes, we want the cold to keep up.

Read our cold story

Hear it from the people who pack them

★★★★★Ice cold for days!!!

These Cooler Shock ice packs exceeded my expectations! They worked fantastic and kept our drinks ice cold the entire time. We only needed one bag of ice in our cooler, and it lasted an incredible 3 days with these ice packs. They really helped keep everything colder for much longer than ice alone. I highly recommend them if you want your cooler to stay cold for extended trips!

Taneka Syverson · July 6, 2026
Hard Case Ice Packs, Clear, 2 Pack
★★★★★Best ice pack I've ever used

Excellent reusable cooler ice packs. They're quite affordable, the pouch is very thick and I'm not worried about punctures.

I was slightly hesitant about them being user fillable, but it's a very straightforward, mess free process that took only a few minutes.

They have not leaked once and I've used them for grocery runs, fishing trips, going out to kids baseball games etc.

I plan on stocking up on different sizes for lunchboxes etc.

Dave · August 28, 2026
Screw-Top Ice Packs, Large 14" x 10", 3 Pack
★★★★★They work!

We got these when looking for an alternative to constantly having to mess with ice while on a 10 day road trip. These little fellas work. We used 3 in a 16 quart cooler in the back of the car and they would still be nice and cold, slushy not solid, 8-10 hours in. Definitely delivered for what we needed for the trip and no messy, wet ice to deal with.

AJ1313 · August 1, 2026
Screw-Top Ice Packs, Small 8.5" x 7.5", 5 Pack
★★★★★Great product worth the price

Love love love these ice packs. Very easy to fill and freeze. They lay flat which is perfect for taller coolers. Sturdy material and light weight. Easily wipe off and reuse. Ours stayed froze all day in about 70 degrees out of sun. Would highly recommend.

Nicole · May 31, 2026
Screw-Top Ice Packs with Handle, Large 15.8" x 11", 3 Pack
★★★★★They work great!!

Stays frozen cold for hours. Very easy to set up and use. Lining the sides of my lunch box cooler is easy and leaves plenty of room for beverages and food. I love them so much I recommended them to several of my coworkers, who also bought sets.

David Najarian · September 19, 2026
Lunch Box Ice Packs, 6.5" x 7.5", 5 Pack
★★★★★Great for long shopping trips

these are the perfect size for a cooler or my cooler bag. I use these regularly for my shopping trips, since I sometimes have to drive 45 minutes to my "go to" store. They stay cold a long time... they are easy to lay in my freezer when I get home and need to refreeze them.

Sandy R · September 26, 2026
Prefilled Gel Ice Packs, Medium 10" x 10", 2 Pack

Reusable ice packs for coolers, explained by the people who freeze them

Why our ice packs stay colder than traditional ice

Traditional ice sits at 32°F and starts giving up the moment the cooler lid closes. Cooler Shock ice packs are engineered around a phase-change mix that freezes at 18°F, so they begin colder than ice and hold that cold longer. In a well-insulated hard cooler, our packs keep food and drinks cold for 24 to 48 hours; in a soft cooler or a lunch bag, expect a full working day. The real difference shows up at the bottom of the cooler: no melt water, no soggy sandwiches, no floating labels.

Because each pack replaces 5 to 7 lbs of ice, you also get space back. A hard case pack is 1.4" thick; a screw-top pouch is about 1". Line the walls with reusable ice packs and the middle of the cooler is free for food, cans and the things you actually brought.

Which Cooler Shock ice packs fit your trip

Hard case ice packs are the most durable option — rigid shells that stack, take knocks on a boat deck and stand on edge against a cooler wall. Screw-top ice packs are the most versatile: soft before freezing, they set flat or curved and come in five sizes, two of them with a built-in handle. Lunch box ice packs, including our prefilled gel packs, are slim enough for everyday lunch boxes, backpack coolers and travel bags.

For road trips and outdoor adventures, mix the two: hard packs on the floor for the long cold, a pouch across the top where warm air enters each time you open the lid. For a daily lunch, two small packs — one above the food, one below — outperform a single big one.

What Cooler Shock ice packs are designed to do

Cooler Shock packs are designed for one job: long-lasting cold with no mess. The cooling power comes from our 18°F formula, and the superior performance shows up on the second day of a trip, when bagged ice is already water. Our customers take Cooler Shock ice packs on road trips, fishing trips, beach days and outdoor adventures, and on travel days when food or medicine has to stay cold for hours.

Each Cooler Shock pack saves you the ice run before every trip and saves the cooler floor from melt water. For many owners, swapping bags of ice for Cooler Shock is the easiest upgrade to their cooler game: freeze tonight, pack tomorrow, and keep the adventures going without stopping for ice.

Caring for a reusable ice pack

Freeze new packs for a full 24 hours before the first trip; hard cases do best with 48. Store them in the freezer between uses so they are always ready. Wipe them with warm soapy water, keep them away from sharp hooks and knives, and they will cycle for many seasons. That durable, leak-resistant build is the whole point: a cooling solution you buy once instead of a bag of ice you buy every Friday.

From freezer to cooler with Cooler Shock ice packs

Questions we get about our ice packs

Straight answers about cold times, setup and sizing.

How long does Cooler Shock last?

In a good hard cooler, our screw-top and hard case packs stay frozen and cold for 24 to 48 hours. Small lunch box packs hold for a full work or school day, about 8 to 12 hours. Shade, a pre-chilled cooler and keeping the lid closed all stretch that time.

How do Cooler Shock ice packs work?

Each pack holds a cooling mix that freezes at 18°F instead of 32°F. Frozen, it absorbs heat from the cooler more slowly than ice melts, so contents stay colder longer. Screw-top packs get water once at setup; prefilled gel packs come ready to freeze.

Are Cooler Shock packs better than ice?

They are colder than ice, they do not melt into water, and they are reusable. Many owners use a few packs plus a smaller bag of cubes on long trips — the packs carry the long cold and the cubes cool drinks fast.

What ice pack stays cold the longest?

Within our line, the 13" x 10" hard case packs and the large 14" x 10" and 15.8" x 11" pouches hold cold the longest, because they carry the most frozen mass. Size the count to your cooler with our chart.

Do I ever need to refill a screw-top pack?

No. You add water one time when it arrives, cap it, and it stays sealed. From then on it simply goes between freezer and cooler.

Are the packs safe next to food?

Yes. The cooling mix is non-hazardous and food-safe, and the prefilled gel packs use non-toxic, BPA-free gel, so they can sit right against food and drinks.

Stay colder than the cooler next to yours

Freeze tonight, pack tomorrow, skip the ice run for good.

Screw-Top Ice Packs, Mid-Size 10" x 10", 4 Pack$29.99