ZOMAKE Lightweight Packable Backpack 20L

The day size: 20 liters and 0.51 pounds. When you are done, it folds into the zipped pocket inside its own main compartment to a pouch about the size of a sandwich. There is no chest or waist strap, so you carry it on mesh shoulder straps that adjust and breathe, and the rip-stop nylon resists tears. It comes in more than forty colors and prints, from silver gray to strawberry and polka dots.