The Big Momma Bike Bag is a durable trunk bag with plenty of space! This is a medium rear rack bag from BiKASE that's universal and durable. The Big Momma trunk bag has plenty of space for your belongings. This is a slightly smaller version of the Big Daddy. - Top mesh pocket - Side zipper pockets - Side and rear reflective accents - Handle for easy carry - Front and bottom straps to attach the rack Specs - 600 denier polyester - Dimensions: 12 x 7 x 7.5 in. - Volume: 550 cu.in.