PickGuideROCKBROS Bike Phone Bag Review: Is Their Best-Seller Worth It?
ROCKBROS makes cycling gear across the board, and this waterproof phone bag — mounted on the top tube, right where you'd want quick access to navigation — is the accessory that tops its best-seller list. At $29.99 it's a low-risk way to keep your phone dry and usable mid-ride, so we checked what the material, waterproofing claims, and warranty actually hold up to on paper.
The bag mounts to the top tube with three adjustable straps and holds up to 0.33 liters — enough for a phone up to 6.5" plus a few small essentials like keys or a card. The front panel is a TPU touchscreen film window, so you can operate your phone without opening the bag, and the body is TPU plus composite carbon polyester with double sealed zippers for waterproofing, plus reflective strips for night visibility. It weighs about 200 grams and measures 8.15"L x 3.74"W x 5"H. On-site, this specific bag holds a 4.76/5 rating from 70 reviews. Independently, ROCKBROS' US store holds 3.7/5 from 58 Trustpilot reviews, with 50% five-star and a real 31% one-star segment — reading the pattern, most negative reviews concern slow customer support response times rather than the products themselves, which is worth knowing going in, especially if you ever need to use that 2-year warranty.
Pros
- Real 2-year product warranty backing the purchase, confirmed on ROCKBROS' own policy pages
- TPU touchscreen window lets you operate your phone without opening the bag
- Double sealed zippers plus TPU/composite carbon polyester body for genuine weather resistance
- Reflective safety strips add visibility for night rides
- Free US shipping on orders $50+; this bag alone ships for $5.99 if ordered on its own
Cons
- Store-wide Trustpilot rating (3.7/5, 58 reviews) is meaningfully lower than the on-site score, with a real 31% one-star segment tied mostly to slow support response times
- 0.33L capacity is enough for a phone and small essentials only — not a full frame bag
- For non-defect returns (wrong size, changed your mind), you cover the return shipping cost yourself
- EU customers get a shorter 14-day return window instead of the standard 30 days
- Touchscreen sensitivity through a TPU film window is never quite as crisp as bare-screen use
Who It's For
Good For
- Commuters and casual riders who want quick phone/navigation access without a full frame bag
- Riders who want a real multi-year warranty backing an inexpensive accessory
- Anyone who rides in unpredictable weather and wants genuine waterproofing, not just water resistance
Skip If
- You need to carry more than a phone and a few small items — look at ROCKBROS' larger frame bags instead
- You've read reports of slow customer support response and want a brand with faster service guarantees
- You want a bare, uncovered screen for the most responsive touch input while riding
How It Compares: ROCKBROS Bike Phone Bag vs Topeak Smartphone DryBag 6"
| Spec | ROCKBROS Bike Phone Bag | Topeak Smartphone DryBag 6" |
|---|---|---|
| Price | $29.99 | $34.95 |
| Phone compatibility | Up to 6.5" | Devices under 17x9cm |
| Touchscreen window | Yes (TPU film) | Yes |
| Mounting | Top tube, 3 straps | QuickClick® system |
| Warranty | 2 years | Not published on Topeak's product page |
Both bags solve the same problem — a waterproof, touchscreen-usable phone holder for the bike — at a similar price. ROCKBROS is $5 cheaper and backs it with a clearly published 2-year warranty; Topeak uses its quick-release QuickClick system, which trades a strap-based mount for faster on/off between bikes, but doesn't publish a warranty length on its own product page.
See Topeak Smartphone DryBag 6" →
Verified Ratings
Key Specs
| Material | TPU + composite carbon polyester |
| Capacity | 0.33 liters, fits phones up to 6.5" |
| Dimensions | 8.15"L x 3.74"W x 5"H, 200 grams |
| Mounting | Top tube, 3 adjustable straps |
| Closure | Double sealed zippers, TPU touchscreen window |
| Warranty | 2 years |
| Returns | 30 days (US), 14 days (EU); buyer pays return shipping for non-defect returns |
| Shipping | $5.99 under $50 order, free $50+; 3-4 business days from US warehouse |
Frequently Asked Questions
Can I use my phone's touchscreen through the bag?
Yes — the front panel uses a TPU film window designed for touch sensitivity, so you can navigate or change music without opening the bag. Like most touchscreen film windows, it's slightly less responsive than bare-screen use, but functional for basic taps and swipes.
Will the bag actually keep my phone dry in real rain?
ROCKBROS' own product photography includes a real rain-spray test shot (shown above) rather than just studio product shots, and the bag uses double sealed zippers plus a TPU-based body. It's marketed as waterproof rather than merely water-resistant, though as with any zippered bag, avoid full submersion.
Verdict
The core promise here checks out on paper: a real TPU-and-composite waterproof build, a touchscreen window that avoids fumbling with zippers mid-ride, and a genuine 2-year warranty for $29.99. The main thing to weigh is ROCKBROS' independent support record — a real chunk of negative reviews point to slow response times rather than product failures, so it's worth having reasonable expectations for turnaround if you ever do need to use that warranty. For the core job of keeping a phone dry and accessible on a bike, it's a solid, well-specified pick.