Dimension of this bike bag: 15.35 x 8.07 x 5.51 inch ( L x W x H). 1 main compartment has 14L large capacity to keep your clothes, phone, phone charger, wallet, cable, earphone, power bank, map or other carry-on items while you're riding. 1 pocket on the side can store umbrella or water bottle (up to maximum 1.77 inch diameter). Made of EVA and PU leather material, waterproof, scratchproof and easy to clean, effectively prevent rain, water, mud, dust from entering this bag quickly. 3 hook-and-loop fastener straps is stable enough to hold this bike bag on the backseat. Make sure it will not move around even though you're riding on a rugged road.