Need a way to carry my 200-500, 2 dslrs, batteries, few lenses, and other valuables as a plane carry on, in a lightweight option that will later collapse into my backpack while wildlife photography hiking for 5 days.

Dear Redditors. I will hike 5 days in Finland with a 50l backpack, in it: tent, sleeping bag, survival, few clothes, snacks, and it will also hold my cameras when not in use which are: 2 regular dslr bodies, 200-500mm large zoom, 2 small lenses, batteries, wipes, towel, wires, padding.The dillema: It is essential I take my cameras, tripod, batteries, valuables, as a carry on a plane. Typically I fill a medium padded lowepro flipside.Because of this backpacking scenario I can't take my camera backpack for a week to hike. It won't collapse enough into my large pack. I planned to use just the padded insert to store the gear inside the backpacking bag or use pouches.But what do I use in a meanwhile as carry on, that can magically collapse whilst in the countryside?those rei nylon pocket backpacks, into which I could put the padded pocket with all camera stuff or individual pouches, might be too flimsy to walk around airport and unsafe in overhead bin, while I'm sleeping as anyone can just unzip easily?Note: I'm already carrying extra duffel that I have to use as protection sack for checking in the 50l pack.Thank you !!! via /r/photography https://ift.tt/2MCRkgd