【Large Capacity】: Large capacity, meets all you cycling need. Large capacity for store many items such as small repair tools, taillight, gloves, phones, power bank and so on. Sub-warehouse design makes the storage space larger. Inside with small mesh and spring belt for placing small things like credit card or small tools.Tip: Due to the saddle bag's shape, the zipper may feel stiff around corners initially. We recommend opening and closing it several times when first used to smooth the zipper's movement.
【Water-Resistant Hard-Shell】: Crafted from high-grade EV material, this hard-shell saddle bag features a smooth, lustrous finish that feels premium. The material itself is water-resistant (not for prolonged exposure). A waterproof zipper provides extra sealing, while the sleek surface repels dirt and moisture – quick to wipe clean. Ideal for daily commutes.
【Buckle Install】: The quick release clip of the cycling saddle bag not only provides excellent stability but also ensure the bike bag can be removed and install in 3 seconds. It's durable, not as easy to break as straps. Incorrect installation may cause the screws to fall out. Refer to the installation method in picture description.
【Safe Design】: There is a taillight hook on the back of the bicycle storage bag for hanging taillight (TAILLIGHT NOT INCLUDED). With silver reflective logo on the back, make you be more safer on night. The unique design will escort your night riding.
【Easy to Install】: Stable sitting bow bracket, there are two screws and one hexagon wrench to help install the bicycle seat bag. Buckle design, allowing the bag quickly install and release in a few seconds. Magic straps help fixed the bag prevent it from shaking. (Note: The bike saddle bag is suitable for the seat with rail width ≤ 55mm and the rail has to have ≥ 20mm of straight frame, takes 130mm from the bike seat to the tire and can’t be installed to seat rail with obstruction.)

Andy (comprador verificado) –
Great for Gravel Bikes.
The reason I gave this a Five is becuase it work as advertised. The bag is great for Gravel bikes. Very strong attachment to the bike, as well as strongly put together. This is well made, not sign of stress after a year and 1500 miles hanging of the back of my seat. It has plenty of room for my bike tool and back up inner tubes. (I carry two). The bag has the ability to attach a light to the bag. As I state, Gravel riders and endurance riders will find the bag very useful with all the room. The bag is big, and my not appeal to road rider looking for a small bag. Hope this helps.
URVANO (comprador verificado) –
none
The item is slightly oversized, as it was touching on my leg while cycling, and I found the zipper a bit challenging to open and close.
np8511 (comprador verificado) –
Faulty Quick Release Clip
After hours upon hours of research, I decided to purchase this saddle bag from ROCKBROS. This bag seemed to check all of the boxes!I’ll start with the PROS:Amazing capacity! The organization features are great, one side for small/slim items and the opposite for larger gear.Waterproof/resistant zippers were easy to manipulate with one hand and even while riding. Also love the ability to secure the zippers to minimize noise.Overall ease of use is great, never thought I could store so much in such a small place.Now for CONS:Width of back at seat post is too wide. I read a few reviews indicating their legs continually hit the bag with each revolution. I can confirm this does happen and it is quite annoying. Tried to trouble shoot anchoring methods as well as change mechanics of my cadence, but after 10+ miles of trail riding the annoyance is too much.Faulty Quick Release Clip:After recommended installation of the bracket (knob facing ground/ threaded end of screw up towards the saddle) the bag continually came unclipped. The result is the bag wedging itself between the back tire and frame, as you can imagine, this can be very problematic when riding. My tail light was destroyed ($20) and the light clip on the bag ripped and no longer usable.All in all, I could’ve gotten over the annoyance of legs hitting the bag while riding. The capacity and ease of use are great, the major flaw for me is the money I am out for a new light, and inability to stay anchored.
RJ (comprador verificado) –
Very hard to open and poor quality
The product looks good but is almost impossible to open. The zippers are very tight and of poor quality. Within a few weeks one of the zipper heads broke. Complete waste of money. I do not recommend this product.
Ahmed (comprador verificado) –
Doesn’t fit to universal seat
Fit certain types of seats only
KSR (comprador verificado) –
Useful but starts sagging. Worth it.
Good volume/ holds a small bottle of water, inhaler, glasses, repair tool kit, keys etc. The velcro loop tends to loosen up so have to keep re strapping it as it starts to sag close to the rear wheel.
Zakaria Fahmawi (comprador verificado) –
جيد
جيد
Carl Armbruster (comprador verificado) –
Almost awesome…. almost
I really like the bag and wants to give it 5 stars but the zippers suck. Tons of room easy to put on and take off but the plastic on the zippers pulled off on first use (I put cord pulls on the zipper nubs) and the bags are hard to zippers close (zippers stick)
william baker (comprador verificado) –
Empty your pockets while riding and…
…place all of that stuff in this under seat case.UPDATE 3/1/21Contacted the company via email the night the zipper broke. They responded the very NEXT day. Told me they would be sending me out a new bag which I would be receiving 3/1/21 – I actually got the new bag on 3/27/21!Thank you Rockbros!UPDATE: 2/24/21Getting ready to load up my new bag for the first time and the zipper on the right side broke. It seemed tighter than mentioned in my initial review that follows and as I was trying to open it…snap – the rubber part came off in my fingers.I’ve seen two other posts where customers have run into the same problem. It is a nice bag and even though the zipper fob did break, the bag is still useful, just a little harder to open and close.ORIGINAL POSTI like the hard case and the amount of space it offers in such a compact size. There are two compartments – one large, one small – on each side of the case with zippers. The larger side has an impressive amount of space to hold tools, first aide, sun screen etc. , while the smaller side is more for a wallet, phone, keys etc.Mounted on my 2020 Giant Sedona. I was concerned about the clip mount fitting with the springs on the rear of the seat – it’s tight, but it fit.The zippers operate pretty smoothly, but are a little tight around the curves when closing all the way (see video); a little soap may help. Obviously, I was only using one hand to operate the zippers while recording and they do operate easier using two hands. I’m sure the more they’re used, the smoother they will become.The case appears to be well made and should hold up well. I like that in addition to the under seat mounting clip, there is also a velcro strap that holds the case to the seat post, so the chances of losing this while riding is not of concern.As always, I will update if this product fails in any way.
BossHawg415 (comprador verificado) –
Love the bag so far
Altough I’ve only had it for a week, this bag is so much better than I could imagine. It has so much room. I am able to keep my multi-tool, tire patches, 7 inch pump, and it still has more room for wallet, keys, phone, and energy maybe two energy bars. It has elastic bands inside and a separate compartments. The mounting seems sturdy and was very easy to install. Bag has a slit in the back to mount the taillight and elastics to keep the zipper in place. Speaking of zipper, I hope it is waterproof, cause it seals pretty good. It does look like it might be a little flimsy though. Awesome bag so far. I showed my buddy and he picked it up on sale. Win/win!
Ctrl+Alt+Review (comprador verificado) –
Sturdy, sleek, and surprisingly spacious
It’s exactly what I needed. The hard shell design keeps everything inside well-protected, no more crushed energy bars or tangled tools. It holds its shape perfectly and doesn’t sag or bounce around while riding.Installation was super easy. It attaches securely under the seat and stays in place, even on bumpy trails. The reflective strip is a great safety feature for low-light rides, and the zipper feels solid and easy to operate, even with gloves on.Despite its compact look, it fits all the essentials: spare chain, multi-tool, torque wrench, patch kit, air pump, flashlight, and pepper spray. And there’s still plenty of space left for snacks and gels. It’s like a little toolbox that just disappears under the saddle – functional without being bulky.
JahmB (comprador verificado) –
Trek Domane
Fits very well with my Trek Domane. Clamps onto the seat and has an additional velcro strap for the seat post. My bike light attaches nicely to the straps at the back too. Overall happy with the purchase, lots of storage space on the inside compartments. Only wish the zippers were a little bit better quality. Sometimes takes two hands to unzip and zip back up cause they stuck. But otherwise well made and sturdy.
Patrick Skeith (comprador verificado) –
Almost perfect *Edit* How foolish I was
Edit 20 May 2022: After riding with this bag a few times the top bracket where it clips in would start coming loose while riding, I didnt think much of it, until it came loose while zooming downhill at 25mph and jammed up my rear wheel. I hurt my ankle pretty good in the spook and confusion and now I can say with sheer confidence that I would not recommend this product to anyone, especially if you like to go on longer rides. I am just glad it happened on the way home from work and not on the way to work, although i am still staying home a day to let my ankle rest up, so in the end it would have cost me less to buy a fancy $100+ bag vs buying this cheap junk.Original Review: My only gripe is that the zippers get caught on the corners, so you have to take your time with it to make sure you dont hit a snag. Other than that installation is a cinch, it holds everything I need it to hold, and it can be removed and attached to/from the bike with ease! Definitely a great purchase at this price range!