Rhinowalk Bicycle Frame Bag - Professional Cycling Accessory-RK18330bout this item Stable & Anti Attrition: We are using two adjust rail systems to keep the bag in place. The straps are long enough to snug it down tight against the front tube and top tube. They are made of non slip soft leather to reduce friction on the bike tube Easy to Open Design: This package is designed with double zipper. Two zippers are connected by a high quality nylon cable. This make it easier for you to get your goods Detailed Design: