The magnetic lid is easy to operate - no messing around with zippers or snaps. The lid is formed in such a way as to prevent rain from coming in. The bottom has stretchy quick mount straps. If your bike frame has dedicated mounting threads for a bag like this and you mount it via them, you can use the versatile straps for other purposes - Durable, 100% waterproof materials: PS21R and PS33 - Charging cable port: you can haul a power bank in the Fuel-Pack, or use a hub dynamo to charge an appliance in the Fuel-Pack - IP53 protection: protected from dust (not completely dustproof), protected from rain at an angle of max. 60º - Max. load 1 kg - 5 year guarantee - Made in Germany - PVC-free