Topeak tri drybag frame fit bagtotally waterproof aerodynamic wedge bag with roll closure sonically welded and seam sealed for durable waterproof protection features convenient top tube mount keeps contents close at handdivided and padded main compartment protects contents and keeps everything organized specificationscompartments divided mainprotection padded main compartmentmaterial 420 denier 840 denier nylon waterproof fabric sonically welded seamsadded features nylon strapsgood f