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3D Shell Bike Seat Bag
Your Ultimate Ride Companion
Whether you're conquering mountain trails, cruising city streets, or commuting on your electric bike, the DANUOSIE 3D Shell Bike Seat Bag is designed to elevate your cycling experience.
Install in Seconds, Ride for Miles
No complicated setups here. The upgraded buckle system and 2 heavy-duty stickup straps make installation a breeze. Compatible with most seat posts—from mountain bikes to road and e-bikes—this bag stays firmly in place, even on high-speed descents or bumpy paths.
Ride Safer, Day or Night
Safety meets visibility with the reflective strap that glows under headlights, ensuring you’re seen after dark. Plus, the built-in rear hook lets you attach a taillight (sold separately) for extra visibility—ideal for early morning commutes or twilight trail rides.
Rain or Shine? No Problem
The waterproof fabric and taped zipper shield your belongings from rain, mud, and snow. Quick to wipe clean and built to dry fast, this bag ensures your phone, tools, and keys stay safe. (Pro tip: While it’s weather-ready, avoid submerging it in water—stitches aren’t fully waterproof!)
Spacious Yet Sleek
With 1L capacity (8.5”x3.7”x4.5”), this compact powerhouse fits all your ride essentials: a spare tube, multitool, tire levers, keys, and even a slim wallet. Its low-profile design avoids bulk while maximizing storage—no more awkward jostling or distractions mid-ride.
Matthew Gibson
Reviewed in the United States on March 4, 2025
This is a unique little bag. The outer material has a ribbed design and I’m not quite sure what it’s made of; I did run it under the faucet and confirmed that the water resistance is effective.It has a good zipper with weather proofing around surrounding it.I like that the back has a strap to hook a reflector or tail light onto.The straps to secure it to your seat rails are nicer than most (it has plastic buckles instead of pure Velcro).The inside flap has a smaller mesh/elastic compartment and a clip that could secure a key ring. Other than that, the interior is one big compartment.I personally would prefer a lengthwise divider inside to secure some wrenches/tools, and then have my tube/wallet/snack separated. But I could understand other people wanting the open space to do with as they please.It seems to be of high quality, so the question you need to ask yourself is whether it’s the right match for your capacity / interior preferences. If yes, you won’t go wrong with this product.
zoomJLzoom
Reviewed in the United States on February 23, 2025
This saddle bag is thick and durable, with a sturdy molded shell to hold its' shape. It holds my phone, keys, wallet, and that's about it. But that's all I really need it to carry.
Todd
Reviewed in the United States on February 21, 2025
This bag fits behind my seat perfectly. It attaches very securely and doesn't move yet I can still use my dropper post. As other reviewers have mentioned, it has plenty of room for a spare tube, patch kit, multi tool, or keys. It's a great design and it's very well made. The walls are rigid and the zipper is rubber coated making it water resistant much like the zippers on my Columbia ski jacket. It has mesh pocket that I keep a multi tool in and there's a clip for your keys as well. As a bonus the pull strings on the zipper are orange which matches the accent color on my bike. I really love how this bag looks, how it's mounted, and the amount of storage it provides. It's a winner.
Kimmelane
Reviewed in the United States on February 20, 2025
Easy to install. Looks very sturdy. Easy to access. my phone and wallet fit inside.
JDL Reviews
Reviewed in the United States on February 19, 2025
This is a sharp looking saddle bag with its ribbed scale like sides. Those same ribs are padded to this bag has more protective padding than most others. I like that there is a mesh bag on one inside as well as on the inside flap. Better would have been both sides, but that is minor.It uses snap buckles for each side attachment to the seat. Most of mine are velcro only which I find perfectly good and probably better than these buckles. When cinched up, the bag is very snug to the saddle. In fact my seat edge fits over it and kind of interferes with the zipper. The zipper is nice and I think is waterproof.
Keith A
Reviewed in the United States on February 18, 2025
This is a very sturdy nice looking under-seat bike bag. It's big enough for a road tire, tire levers and patch kit. It will hold a few more things as well such as small tools for making adjustments while out on a ride. You can probably get a protein bar in there as well. It's easy to attach to the seat and seat post. I like that it has a wide mouth so it's easy to get things into it. It holds it's shape while it's open (it's not floppy). The zippers have pull cords that are easy to grab. It's one compartment with two small inside pockets to help organize small things like a house key or hex wrenches.
truble135
Reviewed in the United States on February 17, 2025
There’s plenty of room for my “Oh s###” kit with some left over for something about the size of a Clif Bar. I could barely zip my old bag shut. The plastic clips make it easy to install and take off as needed and both the material and the zipper are water resistant. My seat is as far forward as the rails will allow and this still fit with no problems.
VF
Reviewed in the United States on February 16, 2025
If I could give it 6 stars I would. My e-bike doesn't have a front basket or rear seat over the fender and it's a step through. (Like many bikes out there). Which means there is no cross bar and the frame is very thick. The seat is also almost all the way down the post. In this scenario, almost all the bike bags I've tried just don't fit right! This one does and its perfect for the small tool kit, spare tube, and any other smaller items. I have a phone mount so I don't need it for that but I certainly want my tools and spare tube with me. Since it's small it also looks great and doesnt detract from the overall look of the bike. Very Nice.
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