The best pocket sized containers I've found are the GSI 420 and 840. They're water and crush proof and open on the end.

I used a 420 to make the equivalent of an altoids tin survival kit for myself. I can wrap paracord and duct tape around the outside and still get in. It can be tricky to get stuff in from the end but mine's pretty packed (I'd like to upgrade to the 840 but the 420 fits in my back jeans pocket too well).