Bike trunk bag Rockbros 30140022004 waterproof 25–32 L blue

The Rockbros trunk bag 30140022004 is a waterproof, rear-rack-mounted bicycle bag with an adjustable 25–32 L capacity in blue. Designed for commuting, touring and everyday errands, the bag secures to a rear carrier and protects clothing, tools and groceries from rain and splash. Durable materials and sealed seams provide weather resistance while the adjustable volume lets you adapt the bag to different loads.

Advantages

The waterproof construction and sealed seams reduce moisture ingress and keep contents dry in wet conditions. An adjustable capacity mechanism allows the volume to be reduced or expanded between 25 and 32 litres depending on load size. The bag mounts to standard rear racks to offer stable carriage and easy access. Materials are chosen for durability and easy cleaning after rides.

Suitable for

• Commuting and daily rides where protection of clothes and personal items is needed
• Short touring or bikepacking trips requiring a medium-capacity rear bag
• Grocery shopping, errands and transporting tools or spare parts
• Rides in mixed weather including light rain or splash-prone routes

Key specifications

• Mount type: rear rack attachment compatible with standard carrier rails
• Capacity: adjustable between 25 and 32 litres
• Material: waterproof fabric with sealed seams
• Color: blue
• Closure: weather-resistant fastening to secure contents
• Access: top opening for loading and unloading

How to use

Attach the bag to the rear rack following the mounting points provided on the bag so it sits centered and stable on the carrier. Adjust the capacity mechanism to match the size of your load, securing any straps or fasteners to compress the bag if necessary. Use the top opening to place clothing, tools or groceries inside and close the fastening to maintain weather protection. Check mounting hardware before each ride to ensure the bag remains securely fixed.

Usage recommendations

For best results, distribute weight evenly on the rack and avoid overloading beyond the specified capacity. If riding in heavy rain for extended periods, consider additional dry bags for items requiring absolute waterproofing. Periodically inspect seams and fastenings for wear and clean the exterior with a damp cloth to maintain water resistance.