Bests & Worsts Reviews from Amazon

This set comes with 40 single wrapped packs of warmers (20 pairs). These are much larger than the dual pack sets and thus, last much much longer than the smaller sized dual packs. What most people don't know is that while these packs have a finite heating time, that time can be put on hold if you cut off the oxygen to these large packs. I use these primarily for skiing / snowboarding. After returning to the car, I put the packs in ziplock bags. Then after I get home a couple hours later, I vacuum seal these with my FoodSaver. Once vacuum sealed, these use up the little remaining oxygen in the vacuum bags and then go right back to a cold dormant state. I've been able to get about 2.5 uses out of these with this method. Try it!