B3FBag Bike Frame Bags. 4L Waterproof Bicycle Frame Triangle Bag. 4L Bike Frame Bag, Waterproof Triangle Packing for Mountain Gravel Bike Bag. This Triangle Bag boasts a spacious 4L design, providing ample room for essentials such as a kettle, pump, mobile phone, gloves, and sunglasses. Ideal for both mid and long-distance rides.
