These gel ice packs from top brands like Igloo and Yeti will keep perishables in your cooler or lunch bag cold for a long time.

Dimensions: 10 x 10 x 1 inches (length x width x height) These medium-sized Cooler Shock ice packs are one of the most popular options you'll find on Amazon with over 2,500 5-star reviews. Also ...

These ice packs have a 4.7-star average from 1,969 reviews on Amazon. Ice packs per set: 2 | Dimensions: 7 x 5 x .25 inches | Style: Soft gel pack Fit + Fresh Cool Coolers ...

Sold in bunches of four, individual ice packs weigh about 0.5 pounds, making them an easy solution for lunch on the go or small coolers. They freeze solid in eight to 10 hours and can be mixed and ...

Fit + Fresh Cool Coolers Reusable Ice Packs: available at Amazon In this set of four slim ice packs, each one measures 4.75 x 4.75 inches for easy stacking or lining in any lunch box, cooler or bag.

Fit + Fresh Cool Coolers Reusable Ice Packs: available at Amazon In this set of four slim ice packs, each one measures 4.75 x 4.75 inches for easy stacking or lining in any lunch box, cooler or bag.

If you have drinks (in the same or separate cooler), pack cans tightly and horizontally with the labels facing up. Put in a 1.5-2.5 inch layer of crushed or cubed ice. Repeat.

The ideal ice-to-contents ratio is 2:1, so don't expect a cooler full of food with just a sprinkle of ice on top to stay cool for very long. Pack as much ice as you can.