Sliding Bike Case with Phone Mount -B-RAIL System

New: V2 with locking tab feature. A few people mentioned that the small bumps holding the drawer closed weren’t strong enough for rough or bumpy bike rides. This new version adds a locking latch to address that issue.

Please let me know how it works for you—your feedback is appreciated. Enjoy! 

New: Added a new version of this bike case without the phone mount. Please check it here!

This is a sliding container designed for the B-RAIL System. It mounts on your bike’s top tube and lets you easily access your items — even while riding. Perfect for snacks or other small essentials, it also features an integrated mount to securely hold your phone on top.

Quick notes:

• The container stays closed using small bumps located inside the frame.
• You can print additional pads in TPU. I recommend adding those if your phone doesn’t have a soft case.
• The knobs are intentionally different: the smaller one is for setting your phone’s position once (to center it on the box), while the larger one is for quick daily removal and re-attachment.

For the full list of compatible accessories, check out the Official B-Rail Mounting Rail.

We’re always improving the B-Rail ecosystem — if you have ideas or suggestions for new accessories, feel free to share them in the comments!

Enjoy your new sliding container with phone mount! 🚴