A larger, structured backpack-style bag, built like a Japanese-style school satchel (boxy, flat-backed, sturdy). The clear panel is usually a large front pocket rather than the whole flap, so it holds more pins/charms than the smaller crossbody styles. Two padded backpack straps, a top handle, and multiple exterior pockets or buckle straps are typical, since it's meant to double as an everyday bag rather than just a display piece.