Helpful info.,thanks... I have 2 different sizes of those gel filled packs and there is space under meat drawer in my fridge so i store them there each one in a plastic bag... its surprising how cold they get.... and I also sew/make those rice-filled bags you can heat up in microwave if anyone wants to know how to make them - use sewing machine, 100 per cent cotton fabric and thread. I like them as you heat up for 2 minutes and they are not too hot, but they do lose the heat in abut 20 minutes but good if you have one on and fall asleep, no risk of falling asleep on an electric pad. You still have to make sure you do not get them too hot though! I don't make many any more cos of neuropathy in fingertips etc. and you can also buy them, but handy for around neck etc. You can also store in freezer part of fridge but I found they took on a food smell....so just use them warmed up - every night as always "something" on my body hurts! J.