BOGZON Waterproof Mountain Bicycle Rear Seat Pack, Bike Saddle Bag/Handlebar Bag/Strap-on Bag/Toolkit, Black The new internal auxiliary mesh bag Rubber bag body bone support Magic strap with the elastic belt buckle The big zippered mouth allows riders to bring along your necessary items while biking The big zippered opening is design for easy access with a light clip on the outside (taillight), a mesh pocket inside and an elastic strap inside