I use a diabetic zippered bag (available at any local chain drugstore and other retailers. It has one big zippered pocket on one side, that can hold batteries, tanks, mods, and your "bigger stuff". It's a big mesh pocket with a zipper across the top. The other side of the pouch has multiple mesh compartments for your smaller things like 3-15 ml bottles of juice, attys, cartos, drip tips and such. There's also a hole at the top of the case that allows you to tuck in bigger 18650 mods, like a provari, legacy, and such. The hole is large enough, yet the material it's made from holds the mod Tightly. You can pack quite a lot of goodies in these little cases. I think mine is made by case logic. A google seach for case logic diabetic case will yield lots of results.