This is the big one in the Modular Velcro line: 15 in wide x 8 in tall x 3 in deep. It is the pocket for the bulk — a jacket, a recovery strap, a camp stove, a first aid kit, the stuff that would otherwise be thrown in the footwell because nothing else on the panel is deep enough to hold it. The Modular Velcro pockets are a system: hook velcro on the back, pressed onto a loop surface — the Modular Velcro Seat Organizer, a velcro panel you build, or the carpeted walls and ceilings of a trailer or camper. Velcro hook strips are included, so it also mounts to a seat back, a van wall or a backpack. At 15 in wide it takes up most of a panel row, so plan the layout around it: put the large cargo pocket down first, then fill the space above and beside it with the smaller pockets. Hand-sewn from 1000D Cordura. Dimensions 15 in wide x 8 in tall x 3 in deep Material 1000D Cordura Mounting Hook velcro backing; compatible with all Modular Velcro Seat Organizers and carpeted trailer/camper surfaces Included Pocket plus velcro hook strips Colors 17 options Origin Hand-sewn in North Salt Lake, Utah Warranty Lifetime workmanship What to know before you buy The bigger the pocket and the heavier the load, the more velcro surface it needs. Give this one a full-width run of loop velcro to grip — a couple of small hook strips on a smooth surface will not hold 15 in of loaded pocket. Pairs with Modular Velcro Seat Organizer — the panel this system is built around. Modular Velcro Mini Cargo Pocket — the deeper, narrower pocket for the space beside it.