My TT Backstory 15 just arrived. I can get my Z7 body with 24-70/2.8 mounted, 75-300 with FTZ, 105 macro, 14-30/4, 50/1.8S, extension tubes, filters, included rain-cover, and still have room for 2 smaller lenses or a flash or a second body in the main compartment. There are some nifty padded retaining pads to keep lenses from rattling around while laid flat inside. In the outer slip pocket, I fit gloves, buff, camera batteries and charger, MBP and charger, cards, card reader and spare drive, as well as enough room for a thin extra layer or rain jacket. A rear outer pocket for sun or reading glasses, 2 collapsable side pockets for water bottle and snacks, and then a very slick hidden rear outer tripod cup and lash strap! The sternum and waist straps detach easily which is a HUGE benefit to me as they rarely get used, are always in my way and so I usually cut them off my other packs -- but these I've got stored in the bottom of the slip pocket should I ever want them. Convenient padded roller bag loop integrated into the back padding. Overall I'm pretty impressed with the design, and it is quite comfortable to schlep as loaded above. Also as loaded above, it is stable enough to stand upright up on its bottom, a convenience while I'm waiting at the gate not to have it leaning against my chair or leg. Also as loaded but without a tripod attached, it appears to meet the smaller EU carryon standard as well. Finally it doesn't look like a camera or computer bag, but like a modern overnight carryon. Overall, I give it 2-thumbs up out of the gate, but time with it will confirm.