Klein Tools 62811 Reusable Ice Packs for Cooler Bags and Lunch Boxes, Interlocking Design, Heavy Duty for Daily Use, Quick Freeze, 2-Pack

Their dimensions are 7 x 5.2 x 1.7" thick. That's thicker than most. They seem to retain cold well. They're not too big, so they fit in various size coolers and between items of food. I like that they're notched so you can stack them when not in use and they don't slide off each other.

My husband practically lives out of this now. It’s much larger than we thought however he can wear it like a back pack and it keeps things cold forever!

Impressed with the quality and cooling properties. The stackability is a little silly, but nothing to complain about. I would buy again.

Haven't used them in the cooler yet. However, they are good quality, seem durable.

I bought these for my husband to go in his Klein cooler. They're very nice and keep everything cold for the day. They're a bit pricy though IMO.

Love these...they look really cool and they work.

Solid feel. Good shape, easy to grasp, can stand on its side. I am very satisfied.

I love how small and compact they are but they don’t stay frozen long and they start to sweat and by the end of the day my lunch box is soaking wet