I think each pack is going to be different for sure....SIZE!!! that's the big thing for me....just for instance I do not have a canteen, however I have a life straw....no room in my fanny pack for the canteen. I would like to have other stuff, however I can just get my zippers closed as it is.....then one could say "get a bigger pack"...for me, this is just about right....I would like more stuff...BUT...I'd have to trade/remove other stuff, which I have done from time to time....I do keep stuff in my truck, like the guns and bottle water...I'll have to make decisions when it come time to use....It would be nice to hear other ideas...for sure

:-)Rocky