How to Choose a Frame Bag for Bikepacking
By Bicycle Superstore | Published: 2026-10-23
Category: How-to Guides
Learn how to pick the right frame bag for bikepacking. Get tips on sizing, fit, and features to match your gear and ride style.
Quick answer
Choose a frame bag by measuring your bike's main triangle, matching capacity to your gear load, and picking a bag with compartments that keep items organized and accessible while riding.
Why frame bag size matters
A frame bag that's too large will bulge or rub against your legs, while one that's too small won't hold enough gear. The right size balances storage with pedal clearance.
Most bikepacking frame bags attach to the top tube, down tube, and seat tube. Measure the length of each tube to find a bag that fits without interfering with your bike's steering or your body's movement.
Capacity and packing style
Consider how much gear you need to carry. A weekend trip might require a smaller bag, while a multi-day expedition demands more space.
Look for bags with expandable compartments—like the Blackburn Outpost Frame Bag Large, which includes an expandable bottom section to accommodate more gear when needed. This flexibility lets you carry extra food or layers without switching bags.
Steps to choose your frame bag
- Measure your frame triangle: Use a tape measure to record the length of the top tube, down tube, and seat tube. Compare these dimensions to the bag's specifications to ensure a snug fit without sagging or rubbing. Common mistake: guessing your frame size. Always measure precisely to avoid a bag that shifts while riding.
- Decide on capacity needs: Estimate the volume of gear you'll carry: small (2-4 liters) for day trips, medium (4-6 liters) for overnight, or large (6+ liters) for multi-day trips. Expandable bags can adapt to varying loads. Checkpoint: pack your gear in a test run to see if the bag's compartments match your organization style.
- Check attachment and access: Look for bags with multiple secure straps (usually Velcro or buckle) that attach to frame tubes. Consider whether the bag opens from the top, side, or both—top-opening bags are easier to access while riding. Common mistake: choosing a bag with poor access that forces you to stop and dig through gear.
Product facts
- Blackburn Outpost Frame Bag Large: The Blackburn Outpost Frame Bag Large features an expandable bottom compartment that accommodates more mission-critical gear. This expandable design lets you add extra capacity for longer trips without buying a second bag, making it versatile for both short rides and extended bikepacking adventures.
Blackburn Outpost Frame Bag Large
