Bike Frame Bag with Magnetic Flap - Waterproof Top Tube Pack

Our review of the Rhinowalk Bike Frame Bag finds it best suited to cyclists who want secure, weatherproof top-tube storage without fuss. The single biggest reason to buy is its combination of a true waterproof TPU construction and a one-handed magnetic flap, which together keep tools, snacks and a phone dry and easily accessible on rides. We tested mounting and everyday use and found the bag to balance low weight with a sturdy feel, making it a practical choice for commuting, bikepacking and gravel rides.

Key Features

• Waterproof TPU fabric: The seamless welding and waterproof material prevent rainwater infiltration so contents stay dry in wet conditions.
• Magnetic flap: The magnetic opening allows reliable one-handed access to items while riding without fumbling a zipper.
• Knob locking mount: The knob locking system with elastic cord secures the bag firmly to the frame and makes removal quick and tool-free.
• Streamlined shape: The bag is wide at the top and narrows toward the bottom to avoid hitting the leg and to reduce wind resistance on faster rides.
• Lightweight construction: At a net weight of about 200g the pack adds minimal mass while still offering useful storage capacity.

Who It's For

This bag is ideal for MTB, road and folding bike riders who need a mid-sized top tube pocket for essentials on commutes, day rides or multi-day bikepacking trips. The waterproof build and magnetic closure suit those who ride in mixed weather and want quick access to items like a phone, wallet, keys, or small tools.

Riders seeking very large capacity storage or a full-frame bivvy system should look elsewhere, and if you prefer internal zippered organization or rigid mounting plates, this simpler elastic cord and knob locking solution may feel less structured than some alternatives.

Pros & Cons

Pros

• Waterproof construction and seamless welding keep contents dry in rain.
• Magnetic closure enables fast one-handed opening and secure holding while riding.
• Knob locking system provides a firm, removable mount without extra tools.
• Streamlined profile minimizes leg rub and wind resistance on fast rides.

Cons

• Size is divisive: some riders find it perfectly roomy, others think it sits larger than expected for a top tube bag.
• No rigid internal dividers for organizing many small items.

Specifications

Our Verdict

The Rhinowalk top tube bag is a practical, well-built accessory for riders who prioritize weather protection and quick access. Its waterproof TPU shell and magnetic flap deliver real-world convenience, and the knob locking mount keeps it secure yet removable. It represents good value for commuters and bikepackers who need reliable storage, though buyers should check size expectations if they prefer a smaller pack.

Frequently Asked Questions

Is this bag truly waterproof?
Yes, the bag uses waterproof TPU fabric and seamless welding to prevent rainwater infiltration.

How is the bag attached to the frame?
The bag installs with a knob locking system and elastic cord that secures it firmly and allows easy removal.

Can I open it while riding?
The magnetic flap is designed for one-handed opening and easy access during riding.