If I remember correctly, the moment you remove an MP1 tablet from its packaging, it begins to react with both the air and whatever container it's in and will soon become useless.

I bought a small Nalgene bottle, epoxied a small plastic loop to the lid so I could hang it off of my caribiner, and put individulal squares of the MP1 packaged tablets in it. Though a small bottle, as part of my key ring it takes up a pretty large amount of space.