25L to 45L Expandable Capacity This bicycle trunk bag expands from 25L to 45L, offering ample space for short and medium distance travel gear and daily commute essentials. Carbon Grain Hard Shell Waterproof The carbon grain hard shell and laminated waterproof zipper keep your items dry in heavy rain, protecting your valuables during cycling. Quick Release Hook&Loop Mounting The hook&loop quick release system enables easy installation and removal, saving your time for bike rack assembly and disassembly. Reflective Strips for Night Safety Bright reflective strips enhance your visibility at night, reducing potential risks and ensuring safe riding on the road. 3 in 1 Multifunctional Design It works as a bike trunk bag, shoulder bag and handbag, fitting cycling travel commute and daily use perfectly. Bicycle Trunk Bag；45L Expandable Bike Bag；Carbon Grain Hard Shell Bag；Waterproof MTB Pannier；Quick Release Bike Rack Bag；Multifunctional Cycling Bag；25L Bike Storage Bag；Reflective Bicycle Bag；Commute Bike Trunk；Travel MTB Pannier；Cycling Trunk Bag；Hard Shell Bike Bag；Laminated Waterproof Bike Bag；Bike Rear Rack Bag；3 in 1 Bike Bag；Road Bike Trunk Pannier；Outdoor Cycling Bag；Bicycle Cargo Bag；Detachable Bike Bag；Cycling Accessories