APIDURA Backcountry Downtube Pack 1.8L frame bag

The APIDURA Backcountry Downtube Pack 1.8L is a compact, waterproof bag designed to utilize the available space on the downtube during bikepacking trips. Its 1.8-liter volume is suitable for carrying tools, spare parts, and other compact equipment. It attaches directly to the frame without the need for a bottle cage or additional mounts and can be installed on various tubes of compatible diameter.

A wide Hypalon-reinforced Velcro strap secures the bag around the tube and helps compress its contents. The Stability Channel with a silicone surface conforms to the tube shape to limit lateral movement, while foam reinforcements improve stability. The asymmetric shape of the lower section reduces the risk of contact with the chainrings.

The bag uses a waterproof, durable three-layer fabric with a cross-ply internal structure, free of PFAS and PFCs. Integrated HDPE and Texon reinforcements provide structure. Radio-frequency welded seams create a waterproof construction suited to the conditions encountered in bikepacking.

The main compartment uses a roll-top closure with a quick-release buckle that allows the volume to be adjusted to the load. For complete waterproofing, the closure must be rolled at least three times. A pull tab facilitates opening and access to contents, while reflective elements improve visibility when lighting conditions are low.

Features

• Usage: bikepacking, carrying tools and spare parts.

• Volume: 1.8 L.

• Attaches to the downtube or a tube of compatible diameter.

• Installs without a bottle cage or additional mounts.

• Not recommended for tubes with a circumference of less than 9.5 cm.

• Waterproof three-layer fabric with cross-ply internal structure.

• PFAS and PFC-free materials.

• Waterproof construction with radio-frequency welded seams.

• Single main compartment.

• Roll-top closure with quick-release buckle.

• Closure must be rolled at least three times for complete waterproofing.

• Wide Hypalon-reinforced Velcro strap.

• Stability Channel with silicone surface.

• Silicone surfaces on the straps to improve stability.

• Foam reinforcements.

• Integrated HDPE and Texon structure.

• Asymmetric shape limiting the risk of contact with the chainrings.

• Sufficient capacity to hold a bottle up to 710 ml.

• Pull tab facilitating access to contents.

• Reflective elements.