ROCKBROS is an original brand founded by cycling enthusiasts. The goal of ROCKBROS is to offer high - quality products at an affordable price to every customer who loves cycling and outdoor sports. ROCKBROS Waterproof Bicycle Frame Triangle Bag 3L/4L Specification: Brand: ROCKBROS Model: AS - 043 Weight: approximately 190g Material: Nylon Dimensions: approximately 40612.5cm Color: Black Waterproof or not: IPX 4 Slim Design Side Pocket Design Easy Installation Waterproof The high - quality outer nylon fabric and seamless TPU inner material provide comprehensive protection for your items. (Note: It may not be waterproof in heavy rain.) Adjustable Velcro Straps With 5 Velcro straps and 11 mounting holes, you can easily and stably mount the bike bag to a suitable position on your bike frame. Large Capacity This triangle bag has a large capacity (approximately 3L) and is extended. You can put many long items in it, such as a water bottle (1.25L), pump. Not Easily Deformed There are supports inside the bag to maintain the beautiful shape of the bag and protect your items inside.