Rhinowalk bike top tube bag, Black, Size Large — waterproof TPU, magnetic flap, knob-lock attachment

Rhinowalk's Bike Top Tube Bag is a fully waterproof, TPU-molded bicycle frame bag with a magnetic flap and knob-lock attachment—built to carry small essentials securely without interfering with your pedaling.

This compact frame bag combines durable TPU construction, a streamlined shape, and a dual attachment system so your phone, keys, and wallet stay accessible and dry on road, gravel, or mountain rides. Designed to sit on the top tube just behind the headset, the bag keeps weight central and out of the way of your knees while offering quick access via a magnetic flap and easy removal with a knob locking system.

How does this bag protect my items from weather and wear?

The bag is made from 3D integrally molded TPU that resists abrasion and sheds water, so contents stay dry in light rain and muddy conditions. TPU also provides impact resistance and keeps the bag shape stable under load.

• Waterproof TPU outer shell throughout the bag
• Seamless 3D molding reduces water entry points
• Wear-resistant surface handles gravel and brush

Will it interfere with pedaling or add wind drag?

Rhinowalk engineered a tapered profile—wider at the top and narrower at the bottom—so the bag sits clear of your knees and minimizes frontal area. That streamlined form reduces potential wind resistance and keeps the bag unobtrusive while climbing or sprinting.

• Tapered top-to-bottom design avoids knee strike
• Low-profile placement on the top tube for balance
• Evenly distributed internal space to prevent bulging

How does the attachment and access system work on rides?

Access is quick with a magnetic flap that snaps shut for fast one-handed opening, while a knob locking system with an elastic cord secures the bag to your frame and allows fast on/off removal. The combination gives both convenience and stability during rough terrain.

• Magnetic flap for rapid, silent access to contents
• Knob locking system plus elastic cord for firm attachment
• Quick-release removal for charging or off-bike use

What fits inside and how much space will I have?

The main compartment measures approximately 9.05" × 2.95" × 4.92" (L×W×H), roomy enough for a smartphone, wallet, keys, small multi-tool, or energy snacks while keeping balance and reachability in mind. The bag’s internal layout resists shifting so items remain secure while you ride.

• Internal dimensions ideal for phones and wallets
• Firm shape prevents items from sliding during rides
• Top-tube placement gives easy access without dismounting

Who is this for: Cyclists who want a durable, low-profile storage solution for short-ride essentials—commuters, gravel grinders, and mountain bikers who value weather protection, quick access, and a stable mount. If you need a lightweight, splashproof frame bag that won’t interfere with pedaling and removes quickly, this Rhinowalk top tube bag is built for that purpose. Contact Rhinowalk customer support if you have sizing or mounting questions.