The Z Adventure R11 is a saddle bag designed to carry a large volume of items without the need for a rear rack Equipped with several durable self-adhesive straps and anti-tear material on its base, this bag attaches to the saddle rails and seat post for optimal weight distribution on the bicycle With a volume that can be adjusted from 5 to 11 liters, this bag is designed for cyclists doing light tours or competing in endurance competitions and bike-packing Equipped with reflective strips and an attachment loop for lights, the Z Adventure R11 is ideal for carrying light, large-sized items such as clothing The folding closure and waterproof fabric with heat-sealed interior can safely carry all the equipment needed for a tour Seatpost 22x5.9x6.7` 671 c.i. Black/Red XX-Large (501-700 c.i.)