The ThinkTank StreetWalker Pro v2.0 slim profile backpack has a substantial capacity, big enough big enough for two pro DSLRs, one with attached 70-200/f2.8 size zoom plus several other lenses. Or two mirrorless CSCs and up to 6 lenses. There's a compartment for a 10" tablet, and a tripod or monopod can be carried on the back. Under-lid and external organiser pockets store accessories and two stretch side pockets take waterbottles or gloves. A seam-sealed raincover is also included.