Apidura Backcountry Full Frame Pack - 2.5 L
The Apidura Backcountry Full Frame Pack is an ultra-durable, lightweight and seam-welded waterproof frame bag that fills the entire main triangle of a mountain bike for multi-day trips. Available in 2.5 L (215 g), 4 L (275 g) and 6 L (315 g), it carries heavier loads low in the frame, opens with a full-length dual zip and is compatible with the Frame Pack Hydration Bladder.
Why a full frame pack – and why this one
Heavy items such as cooking gear and larger tools upset bike handling when they sit high on the handlebar or behind the saddle. The main triangle is the most stable place on the bike to carry weight. The Backcountry Full Frame Pack makes full use of it on technical trails:
- Handling stays predictable. Utilising the full space within the frame keeps the centre of gravity low, with minimal effect on bike handling.
- Everything is easy to reach. A dual zip opening on the drive side gives access while riding and full visibility of the contents when stopped.
- Nothing rattles. Internal lash straps secure your belongings on rough terrain, and an anti-rattle pocket on the non-drive side keeps small items in place.
- Water without bottle cages. The pack takes the Frame Pack Hydration Bladder, with a mounting tab for stability and a hose port.
- Weather and trails are not a problem. Hexalon body fabric, 420D embossed nylon reinforcement and RF-welded seams make it waterproof and ultra-durable.
Who is it for?
- MTB bikepackers on multi-day off-road adventures who need maximum, stable frame storage.
- Riders carrying heavier kit – cooking gear, larger tools – who want it low in the frame.
- Off-road racers – the Backcountry Full Frame Pack was ridden to 1st place in the Hellenic Mountain Race (2025).
Which size? Frame pack size should be chosen by the dimensions and geometry of your frame, not by the capacity you want. Compare the dimension drawings below (2.5 L, 4 L and 6 L) with the inside of your frame's main triangle before choosing.
Key features
Dual zip opening
Easy access while riding and full visibility of pack contents when stopped.
Internal lash straps
Secure your belongings and reduce rattling on rough terrain.
Hydration bladder compatible
With a mounting tab for enhanced stability and a hydration hose port.
Internal pocket
Keeps valuables secure and close to hand.
Reflective graphics
High-contrast reflective design enhances visibility in all light conditions.
Ultra-durable, lightweight body fabric
Welded for waterproofing and reinforced for the trails.
Materials & technology
- Hexalon – lightweight, waterproof and weldable trilaminate of TPU, nylon and PU developed for Apidura. PFA- and PFC-free.
- 420D embossed nylon – durable, semi-rigid woven nylon with good abrasion, tear and puncture resistance.
- Durable – built to last, using bespoke fabrics and tested designs to endure the harshest conditions.
- Welded waterproof – RF-welded seams and bespoke fabrics for a 100% waterproof, ultra-durable construction.
Specifications
| 2.5 L (FBS) | 4 L (FBM) | 6 L (FBL) | |
|---|---|---|---|
| Storage | Main compartment, anti-rattle pocket on non-drive side, internal zip pocket, internal lash tabs | ||
| Closure | Waterproof zips (dual zip opening on drive side) | ||
| Attachment – top tube | 2 × Hypalon-reinforced velcro straps | 3 × Hypalon-reinforced velcro straps | |
| Attachment – seat tube | 2 × Hypalon-reinforced velcro straps | ||
| Attachment – downtube | 3 × nylon straps | ||
| Structure | HDPE integrated structure | ||
| Waterproofing | Seam welded – bespoke materials and RF welding create watertight seams | ||
| Visibility | Reflective graphics | ||
Care & maintenance
- Lubricate zips – clean and lubricate regularly with silicone- or petroleum-based grease to maintain performance.
- Spot clean only – stains can be spot treated with concentrated dishwashing liquid. Abrasion is not recommended.
Frequently asked questions
What size Backcountry Full Frame Pack should I choose?
Choose by the physical dimensions and geometry of your frame, not by carrying capacity. Check the dimension drawings above against the inside of your frame's main triangle.
How do I carry water with a full frame pack?
The pack fills the space normally used by bottle cages, but it is compatible with the Frame Pack Hydration Bladder, which sits in the base of the pack; the drinking hose exits through the dedicated port for hands-free drinking. The underside of the downtube can also be used for an extra bottle.
How is it attached to the frame?
With Hypalon-reinforced velcro straps on the top tube (two on the 2.5 L, three on the 4 L and 6 L) and the seat tube (two), plus three nylon straps around the downtube.
Is it waterproof?
Yes. Bespoke materials and RF welding create watertight seams, and the zips are waterproof.
About Apidura
Founded in 2013, Apidura designs bikepacking bags for long-distance and ultra-endurance riding, tested by riders on events such as the Transcontinental Race and the Tour Divide. The range is built around three families: the fully waterproof Expedition series for touring and all-weather bikepacking, the lightweight Racing series for ultra-distance racing, and the rugged Backcountry series for off-road trails.
Every Apidura product comes with a 3-year producer guarantee from the date of purchase, covering the entire product. After that, Apidura can support at-home repair or recommend a trusted repairer.
