Has anyone checked a pack as baggage? If so, how did you prep. it for travel? I'm flying to New Mexico with my son in a few weeks and we need to obviously check our packs. His is an internal frame and fits nicely in one of my old military sea bags. Mine is an external and I haven't found a duffle yet to possibly put it in that isn't monster in size. One thought I have is to just remove the shoulder straps and hip belt and send it through? Maybe tape or zip tie the connections to keep them closed? Anybody with experience in this? Thanks in advance...