ROCKBROS Bike Bag 4L-7L for Brompton Folding Bike

Expandable Storage for City Rides  Short Trips

Designed for folding bikes, this multifunctional bag combines adjustable capacity, waterproof protection, and portable convenience. Whether you're commuting to work or heading out on a short adventure, it's ready to adapt to your needs — and your style.

Key Features:
Adjustable Capacity: Expands from 4L to 9L with a simple clasp adjustment for flexible packing
Easy Installation: Mounts in minutes with provided tools; stays attached even when folding the bike
Waterproof & Leakproof: Durable outer shell and leak-resistant lining protect against rain and spills
Short-Term Insulation: Aluminum foil lining helps preserve food temperature for short trips
Dual Use Design: Doubles as a stylish crossbody bag with hidden mount compartment
Smart Storage Layout: Separate compartments keep items organized and easily accessible
Hidden Mount Design: Zip up the mounting base for a clean, everyday look when worn off the bike