Like new REI Tech Tour 60L travel backpack, only used the main body of it once with cover over it for a flight.
This pack converts all sorts of ways, can add metal stays for stiffness, used with or without the waist belt, top pouch is removable and can also be worn as a small day bag sling or waist pack with include strap. Adjustable torso, front main compartment opens like a suitcase, has mesh inner side pockets, hydration reservoir compatible, stretch side pockets for water bottles, lockable zippers, hoops for trekking poles or ice axes, stout carry handles on top and side, and an integrated cover which doubles as a rain cover.
Really well designed pack that I never used as intended, just as a carry on for an overnight trip.