I'm trying to find a travel-friendly backpack for my gear. By travel friendly i mean: light and within max-carry-on-size limitations for most airlines has security/anti-pickpocketing features it's comfortable enough to use it as a general-use backpack at destination leaving some things at the hotel i also want to use it to carry, while traveling: a FF mirrorless such as Z7-II (currently i only have a D7100) 24-70 70-200 15-16 laptop maybe 14-24 maybe a fast prime a couple of filters some extra clothes while not traveling I'd like to be able to carry or store most of my other gear: flash/es 105 macro plates, etc i've been browsing around. I found a lowepro protactic 450 which seems to suit most of my needs but includes a lot of quick access (sides, top) zippers are not lockable not sure if the space inside is reconfigurable for "more than photography" it weighs over 2 kilos empty on the flip side, it seems to be very comfortable and includes a waist strap. there is also the peakdesign travel backpack but it's very expensive like most PD products it's modular, so besides the base price you need to buy "cubes" for the types of items you need to store does not seem to be as practical as the lowepro one it's heavy and with the required cubes it's heavier than the lowepro the big advantage of the peakdesign is that it includes anti pickpocketing features, such as the ability to tuck zippers in, and tie them to anchors inside the backpack. for the main zipper, it even includes a little loop which makes it impossible to quickly pull a zipper, but is able to be opened without much effort if you know how. it can also be "compressed" a little if you don't need all the space, which makes it good for walking around your destination with a slightly smaller backpack. what other alternatives do you recommend? so far the best i can come up with is just the protactic 450, and zip-tie some of the zippers to disable them semi-permanently but i'm not fully convinced.