Kotaman
WKR
I actually own the MR popup 28, it totally bothers my back, I don't know why. I have had it fitted and everything, sent pictures in of it on me to MR, they didn't see anything wrong with the fit, it just doesn't fit me right. The adjustment on the padding rubbed me wrong. I am the only one that I have seen on any review that even has a complaint about it, so I must be an anomaly. Am looking at the Eberlestock HiSpeed II, it will carry a lot I know, their backpacks are heavy though, but at 60-80 lbs whats a pound or so...
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Flying international is not the same as flying domestic, they are a lot tighter on rules, 22' long but get free checkin up to 2 bags. Checkin doesn't work for me, I don't have time, ie an extra hour, to get my check in plus all that goes with it on the other side of where I fly to. Also, too long of a bag, just fyi, when walking in real jungle with lots of thorns everywhere, gets hooked a lot more, much more of a pain. Tried it, didn't like it.
I have flown MULTIPLE times to Canada, Mexico and Africa with 25 and 26 inch frames and never been questioned.