STABLE AND 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 tubeEASY 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.PERFECT FIT: The bag has a shape body. It's only 2.4 inches wide and perfect fit your bike frame. Your legs won't touch it at all while ppedalling.OPTIMAL STORAGE ROOM FOR SMALL ITEMS: The main compartment is 7.9" x3.9" x 2.6". It fits small essential items like a cell phone or a wallet.International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.