I have used different types travelling and its all about what want or need to take. I used the pelican 1610 when I went to Cal. I fit my G-3, Optike, Alt, Jump suite, log book and PC-105. It ended up being a vary tight fit and everything had to be in the right position or it wouldn't close. I also just used the 1650 when I went to the PIA in Jacksonville tons of room fits everything the 1610 did and would have been able to fit at least my still + another jumpsuite and Helmet and not have to pack it like I am doing a reserve repack, but thiers a down side to going bigger. The weight was at 63lbs with out the extra stuff ,but I did notice the baggage handlers didn't have a problem getting everything back in with out messing things up too bad ,or you can just carry it on if your concerned about them screwing with your stuff just make sure you bring some extra cypres cord to tie your reserve closed if they decide to pop it . Peace!