Features1Roll down closure system compresses to 3L for daily use, or expands to 10L for multi-day trips. 2Ripstop nylon fabric, this bag will protect your items from water, dust and dirt during Cycle. 3Interior board for strong support. 4You can fix your cloth, water bottle or maps on the bag with elastic string. 5Reflective patches increase visibility when light strike on it. 6Easy and quick fix the bag on the seat post and secure it in place with fastener tape and quick release buckles.SpecificationDesigned with a roll-top closure allows you to adjust the capacity from 3L to 10L. Easy to mount and fix on your bicycle seat post, great for long distance riding journey. Features:Roll down closure system compresses to 3L for daily use, or expands to 10L for multi-day trips. Ripstop nylon fabric, this bag will protect your items from water, dust and dirt during Cycle. Interior board for strong support. You can fix your cloth, water bottle or maps on the bag with elastic string. Reflective patches increase visibility when light strike on it. Easy and quick fix the bag on the seat post and secure it in place with fastener tape and quick release buckles. Specifications:Material: Nylon Capacity: 3 - 10 liters Size: Weight: Approx. 360g / 12.6oz Package List:1 * Bike Saddle BagPackage List1 * Bike Saddle Bag