Peak Design Camera Cube v2

The Large version fits my full-frame body with a 70-200mm lens attached, plus two smaller lenses stacked on top. The rigid sides keep everything from shifting around in my duffel, which is exactly what I needed for air travel.

I've been using the Medium size for my mirrorless kit, and the adjustable dividers make it so easy to reconfigure for different lenses. It fits perfectly in my backpack without wasting any space.

The Large swallowed my 70-200 and two primes with room to spare, and the dividers actually stay put instead of sagging. I drop the whole thing into my hiking pack and my gear's protected.