Waterproof Bike Rear Rack Bag with Expandable Storage

Carry your cycling essentials with this versatile 3-in-1 bike rear rack bag, designed for mountain bikes, road bikes, and city commuters. Featuring expandable 20L–35L storage, detachable side pockets, and a waterproof rain cover, this bicycle trunk bag makes it easy to organize gear for daily commutes, long rides, and weekend adventures.

Key Features

• Expandable 3-in-1 Storage: Increase capacity from 20L to 35L with an expandable main bag and two detachable side pockets, providing flexible space for cycling essentials and travel gear.

• Water-Resistant Protection: Durable, splash-resistant Oxford fabric helps protect belongings from moisture, while the included waterproof rain cover provides additional protection during wet rides.

• Versatile Carrying Options: Use the detachable shoulder strap to carry the bag over your shoulder or transport it by hand when you're off the bike.

• Organized Compartments: Features a spacious main compartment, front zippered pocket, top elastic cord, and drawstring water bottle pouch for convenient access to essentials.

• Foldable and Rack-Compatible: Fits standard bicycle rear luggage racks and folds for compact storage when not in use, making it practical for everyday cycling and travel.

Specifications

• Material: Wear-resistant Oxford cloth with splash-resistant fabric

• Capacity: Expandable 20L–35L (approx. 5.3–9.2 US gallons)

• Standard Dimensions: Approx. 15.0 × 9.4 × 10.2 inches (38 × 24 × 26 cm)

• Expanded Dimensions: Up to approx. 15.7 × 10.6 × 15.7 inches (40 × 27 × 40 cm)

• Design: 3-in-1 expandable rear rack trunk bag with detachable side pockets

• Compartments: Main compartment, front zipper pocket, two detachable expandable side pockets, drawstring water bottle pouch, and top elastic cord

• Compatibility: Mountain bikes, road bikes, and city commuter bikes equipped with standard rear luggage racks

• Features: Expandable, foldable, splash-resistant construction

• Included Accessories: Waterproof rain cover and detachable shoulder strap

Whether you're commuting through the city or exploring new cycling routes, this expandable bicycle pannier bag offers convenient storage and flexible carrying options for every ride.