Bag attaches to x-pen for storage of side covers. Made of waterproof, mildew resistant, marine-grade PU coated polyester has top Velcro closure. Dome snap fasteners attach bag to your x-pen for use as an accessory bag when sides are in place. Available in four colors to match your side covers. Also makes an ideal bag for storage of supplies or gear when attached to an x-pen or wire crate. Measures 14" W x 15-1/2" D (36cm x 39cm).