So I have a chance to buy some Pelican and Storm cases real cheap and I am wondering, other than weight, do they offer anything being in my pack for day hikes and overnight camping? I will most likely buy them anyway just because these case can be so useful in so many ways. I was thinking about packing my first aid kit in one and maybe my fire kit in one as they are water proof. They are the small ones about the size of an iPod case. Any thoughts? Does anyone use something like this in their pack?