Another alternative would be to use a Nestle's Quick container. They come in several sizes so you can choose the size of your kit by the size of the container. Bright yellow plastic which is good for finding it if dropped in the dark or inside your bag. Easily sealable with some tape. Me and my buddy make some FAKs out of these a while back, works well IMO. And there is the bonus of tasty chocolate milk while emptying the can although there is also strawberry and I believe vanilla(the vanilla is usually in the hispanic specialty foods section

-Bill Liptak