I always wear my B/C (other folks wear coats...that's my coat) I put it in the tray with my shoes..It fits in the overhead, my carry on is on rollers..easy roll for plane changes, and fits in the overhead.. has my regs in it, favorite mask, wetsuit..a full size pillow straps in on top...I use a lap-top back pack, plenty of room fot the lap top and for stuff I want ready access to..passport. Credit cards, cash, aluminum water bottle..ect..and fits under the seat...Yes, I've been culled from the line...because I wear a brace for walkin' (Only once did somebody ask about the B/C..a brave little lady asked if it was a inflight jump jacket, during a plane change in Dallas,could have been struck by lightin' right then, cause I said yes)