Nice Packs Reusable Dry Ice Packs for Shipping Frozen Food, Coolers, Lunch Boxes - Flexible and Long Lasting (10 Mini Sheets)

I realize these are not marketed for medical use. That said there have been two times I needed very long lasting ice packs post surgically and these were amazing.1. I had carpal tunnel surgery and had to drive for eight hours four days after surgery. I could not have done it with out these ice packs. They are frozen/cold for about 8 hours in a temperate environment. I did not have to leave it on my hand for an extended amount of time but it was available to me when I needed it for the whole 8 hour drive.The self activated ice packs you can buy are not great, they are never cold enough nor do they last more then 20 minutes. Plus a lot of them are faulty and don't activate when twisted.2. I recently had bilateral knee replacements, these have been amazing I went to a Penatonix concert 6 weeks post op and would not have been able to do so with out these ice packs. You can cut them to size if they are too big. I used a knee brace/wrap made to hold ice packs that I could slide this one into instead and then could velcro to my knees. I also use them on my knees at home. They are the right temperature and last again around 8 hours. They do not take up huge amounts of freezer space because you have to have so many to be able to switch them out.If you are going to have surgery and will need to be icing BUY THESE you will thank me later.ONLY CON: (But with a solution.)I put them in a zip lock bag after hydrating them and then freezing because after a while with extended use they can break and gel beads can come out with extended use. The ziplock bag just makes it so they don't make a mess you have to clean up while in recovery.

These were great, once soaked in water they expand huge, great value.

Brace yourselves...long review ahead.I used these cold packs, in combination with some styrofoam boxes, to mail homemade hot chocolate bombs that were made with ganache (aka milk aka perishable) overseas to the UK and to Trinidad (yeah in the Caribbean...I'm crazy, I know). But let me tell you these babies kept the items cold!Both items were picked up on a Saturday and were set to arrive on the following Tuesday. The one going to the UK I was less worried about because it was going from New England to the UK in December. That one arrived with the packs melted but still cold! I was super happy about that. But where they really shone was in the second shipment to Trinidad.Storytime: So if any of you know what the weather is like in the Caribbean, you understand how concerned I was that the hot chocolate bombs would arrive in a melted, spoiled-milk mess. So I packaged it up as best I could, said a prayer and had the carrier pick it up on a Saturday at midday. The package sat in holding all weekend, got transferred to Puerto Rico on Monday and then sat there for a further 2 days. Tuesday rolls around and it's still in PR, so now I'm freaking out. It finally gets transferred to Trinidad on Wednesday and sits there for a further 24 hours...in 80-90 degree heat *cue dismay*. It FINALLY gets delivered on Thursday morning a full 5 days after initial shipment and guess what. The cold packs and the hot chocolate bombs were still cool! Mind blown...these things are phenomenal y'all. I promise you...it's money well spent.Ok I'm done. Getting off my soapbox now cuz they're not paying me for this review. But seriously...5 stars. More if I could

Excellent product.

My husband and I used these in our CamelBak's for a music festival and Boy did they hold up!103° weather couldn't stop these ice packs. We would put them into our packs first thing in the morning and would still have cold water at midnight after refilling the packs with warm water multiple times throughout the day.They are super easy to get set up and we're a total lifesaver! We will definitely be using these again.