Fits perfectly on the shoulder. For cold packs that stay cold longer, I use several knee pads in my shoulder pack holder. I need 4 or 5 of these packs for continuous ice cream throughout the day. Packing is enough for a maximum of 15 minutes. Cold rating: 7/10. (10 is the coldest). (Not very cold compared to other packs. But worth the money and fits). These bags take 4 to 4 1/2 hours to cool sufficiently in my freezer. After about 2 hours they reach a cold rating of 4.5 out of 10. But they only last 10 minutes and only cool the skin, not deep-freeze. I'm an athlete and don't want to take painkillers, so I'm looking for a freezer. You should be aware of changing these bags to the freezer every 15 minutes. In my ice pack cycle, they freeze the longest and last the least. If you have a good freezer, you can get 2-3 real uses a day. If you have packs that freeze faster or stay cold longer, I would use those, alternating with those for fresh ice and shorter acting, slightly warmer ice to prevent frostbite. In combination with the Velcro shoulder strap, this backpack is also very soft on the day of the operation in the days after the operation. Your shoulder is lighter and very gentle on your shoulder.
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