The short version
- Check compatibility before buying
- Prefer simple, durable fittings
- Do not obstruct lights or moving parts
- Inspect after the first few rides
Confirm rack and hook compatibility
Measure the rack-rail diameter and check that the bag's hooks, lower retainer and adjustment range match it. Fit the bag so a heel cannot strike it and so no hook or strap can enter the rear wheel.
Observe the rack, frame and bag limits and use the lowest figure. Divide a heavy load between sides where practical, then test braking and low-speed handling away from traffic.
Choose access or sealing deliberately
A roll-top with welded seams is a strong starting point when contents must remain dry, while extra external pockets improve access but may be less weatherproof. A separate dry liner adds protection for electronics and paperwork.
Inspect hooks and lower retainers for wear, and confirm replacement fittings are available if the bag is intended for long-term daily use.
Check the current guidance
Rules, schemes and product ranges can change. These live links are the authoritative or independent starting points used for this guide.