Brand: ROCKBROS Product: Top Tube Bag Material: Butyl Rubber (from bicycle inner tubes) Weight: 183 g Capacity: 0.5L Color: Black Butyl Rubber Material & Uniqueness Crafted from 100% butyl rubber (recycled bicycle inner tubes) and recycled tires. Each bag retains the unique tire tread pattern – pressure-resistant and deformation-resistant. Eco-conscious and individual. Tool-Free Click Mounting Innovative click-and-twist system – quick installation/removal without tools. Easy position adjustment, secure hold without slipping. Large Opening & Sleek Design Large, unobstructed opening for easy packing and unpacking. Also fits larger items. Soft fleece lining protects contents. Compact & Bike-Optimized Small and frame-hugging – does not interfere with riding. Integrated carry handle – instantly converts the bag into a handbag. Brand Quality & Durability Deeply embossed logo for a premium look. Robust, aging-resistant rubber – maintains shape even when folded. Fits folding bikes, road bikes, and other bicycle types.