WATERPROOF AND DURABLE:The bag is made of a material called "Twill Fabric" which is made of three kinds of materials through high temperature heat.The surface and inside both coated with a special waterproof thicker coating. The middle is the well-knit Nylon mesh. Even in the harsh outdoor conditions, this bag can be waterproof and wear-resistant. 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 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. PERFECT FIT: The bag has a shape body. It's only 2.36 inches wide and perfect fit your bike frame. Your legs won'for t for touch it at all while ppedalling. OPTIMAL STORAGE ROOM FOR SMALL ITEMS: The main compartment is 20*6*10cm. It fits small essential items like a cell phone or a wallet. Rhinowalk MTB Bicycle Front Frame Bags Waterproof Cycling Tube Bag Large Capacity Road Bike Pannier Phone for Case Black RK18330 Item Name:Rhinowalk Bicycle Cycling Tube Bag Tube Bag Color:Black Bicycle Bag Size:20*6*10cm Bag Capacity:1.2L(6.5 Inch Cell Phone,Sunglasses,Gloves,Repair Tools,for Key.) N.for W.:118g Ultralight Open :Full Waterproof Zipper Feature:Bicycle Front Tube Bag,Hand bag, Multifunction,Fixing Straps Removeable Become A Storage Bag Package Included Main Bag *1 Inner Panel*1 Fixing Strap *3 Notice: Actual color may be slightly different from the for image due to different monitor and light effect. Please allow 1-3cm deviation due to manual measurement.