WATERPROOF & DURABLE - Bike Top Tube Bag Is Made of Ultralight and Stylish Composite Carbon Polyester Material With Sealed Double Zippers Closure, Which Ensures the Water Doesn't Flow Into the Bag. The Sun Visor and Flashing Board Is Great to Use for a Rainy or Sunny DayEASY TO INSTALL - 3 Straps Are Long Enough to Sturdy Hold the Bike Bag on the Bike, It Doesn't Move Around When Tightened Even if You Ride on a Bumpy or Rocky RoadLARGE CAPACITY - Enough Space to Put Wallet, Phone, Keys, Glasses, Water Bottle,multi-function Repair Tool, Gloves, Small Bike Lock, and Other Small Things That You Want to Take It With YouHIGH SENSITIVE TOUCH SCREEN - TPU Film Window Helps You Use Your Cellphone Easily While Riding, and Both Sides of Bags Reflective Tapes to Protect Night Ride SafetyUNIVERSAL SIZE - Suitable for Smartphones Within 6.5 Inches, Compatible With I-phone 8/ 8plus/7/7 Plus/6/6s, Galaxy S7/s6/s6 Edge, Galaxy S5, Google Nexus, Lg, Etc Measurements:Length: 20cm, Width: 11cm, Height: 10cm