1. Whale bicycle rack bag is made of composite EVA and Bayer TPU in Germany. We try our best to use high-quality materials to produce our bicycle accessories and make it your best riding partner. 2. Super large internal space, which can hold mobile phones, power supplies, wallets, repair kits, etc. The double-layer mesh bag design of bicycle bag ensures a large main compartment and prevents items from accidentally falling. 3. Bicycle mobile phone bracket is suitable for any bicycle with frame. With three magic straps, you can adjust the mobile phone bracket on the bicycle frame and the upper tube of the bicycle. This bike rack bag is very suitable for your bike! Never disturb your knees or legs when riding. 4. The integrated design and 3D die-casting process make the whale-falling EVA bicycle mobile phone bag hard, compressive and waterproof. Therefore, this bicycle mobile phone bracket is durable, shockproof, compression-resistant, and does not deform. This bicycle bag is a perfect and indispensable bicycle accessory. 5. The reflective belts on both sides of the bicycle bag can ensure the safety of riding at night.