RhinowalkBike Saddle Bag Waterproof Bicycle Under Seat Bag Quick Disassembly Rainproof Mountain Road Bike Seat Bag Bicycle Professional Cycling Accessories

I bought this based on positive experience with panniers by the same maker, and haven't been disappointed so far. The size holds my roadside repair kit with room to spare, without seeming bulky or large on the bike. The included mounting bracket is easy to screw into place by hand and once attached holds the pack without slipping down, and allows it to be detached and reattached easily by pressing a tab. I haven't yet had opportunities to test the waterproofing, but the material and construction (zipperless, closing by fold-and-buckle) seems the same as the panniers, which have held up to multiple downpours.This is the third seat pack I have tried. Compared to others:Pros:1) Waterproof construction: As noted above, I haven't been caught in the rain so far to test but it seems solid.2) Attachment: Packs that fastened via straps slipped down on my bike, winding up semi-vertical near the seat tube. This one stays in place where fastened, and is easy to remove and reattach.3) Size: Small enough to fit unobtrusively on my bike, large enough to hold my every-ride items (spare tube, patch kit, tire levers, multitool, axle-nut wrench, Schrader valve-core tool, small rag, facemask for the COVID era) with room to spare.Cons:1) None so far. I will update if the waterproofing does not work as hoped.Other:1) Not much internal structure: There is a flap with mesh pocket, otherwise just the space enclosed by the outside walls. This fits my preferences but those wanting pockets and compartments might want to look elsewhere.Update:I am still pleased with the pack one month in, and the contents have stayed dry during rides through moderate rain and a drenching downpour.

Water can still get in but still I think it’s a great buy. Great capacity, nice looks and will not move even in the bumpiest roads.

My view on Rhinowalk as a brand is strictly hit-or-miss: in that acquaintances who swear by some things they make have 'gifted' me more briefly-used Rhinowalk bags (due to multiple grievous design flaws) than I've ever purchased. That being said after 1+ year of mostly road/commute use with only a couple crashes... The polyethylene plastic sheet curved around the top, front, & bottom that acts as the frame of the bag is thin but holds it's form without any bending or warping over time. The thin TPU shows only minor wear & scuffing around the fold points. The TPU sheath seals have held all around the frame without any gaps or bubbling & I can still run the bag under a water hose for 5 min. without any moisture getting in. Of note: during long rides in the rain there is some minor seepage along the exposed outer folds of the bag. I'd recommend not overloading it & keep the mouth double-folded to keep things dry. The plastic seat-clamp/arm bracket still keeps the bag secured to the seat. The seat clamp will always move gradually back-and-forth a bit, but stays fixed without wobbling or the clamp bending/loosening. I would have sworn on a stack of bibles that the seatpost strap sewn into the TPU sheath would be the 1st thing to break, but there's no material distress at the thread points & the velcro holds after multiple daily detachments. The side-release buckles keeps the bag securely fastened. There's no zippers designed to prematurely fail & even if one of the buckles break you still can't even open the thing unless both do simultaneously. 1.2 L of volume is the right size for the amount of material it can reasonably hold without failure. I've routinely loaded it with .9- 1.2kg (2- 2.5lbs) of gear without any noticeable flex or wear on the seat clamp, erosion on the plastic swivel joint teeth, nor any TPU seam tears. That's going down pothole-ridden roads: I would keep it lightly packed if you plan to use it for mountain biking.Also, it's conveniently theft-proof so long as you take it with you.Beyond that it's one of the few things I've ever bought blind off Amazon which I can't really think of much to nitpick about.

Good for value. Easy to install and feels sturdy. WARNING: isn't fits aero seatpost. I asked before purchasing and they answered me it would fit but isn't.

Size, just right, not too big. Holds tube, pump, phone, wallet, tools, other soft oddments.Took a minute to install, and I'm a clutz.Velcro and clips are much easier to open and close than a zipper. A zipper was the glaring Achilles heel of two previous bags.It's just black with a small piece of reflective tape and the logo. Not flashy--suits me fine.Looks water proof. Stitching, glue, whatever is holding the bag together looks durable. Time will tell.I'll report back if it falls apart, but out of the gate (today was the first ride with it) it looks like a great buy.

Got caught in the rain on a ride and everything inside the bag was damp. All my tools got rusty =(

This bag is a permanent addition to my bike. It is very well made and designed. It can hold a lot more than I expected. I can fit my phone, food, a patch kit and a flashlight in this with some room for smaller items. - The buckles paired with the velcro at the openening are very secure. I have no hesitation to trust it with my phone or wallet. - The material is completely waterproof from rain or water splashed from the back wheel. - The quick release is perfect for making stops and taking the bag rather than taking things out. -it's very stylish and can easily fit the aesthetic with many other bags to expand your storage. - the reflective strip is very well made and bright. Overall I'd give this a 10/10 for it's performance, style and build quality.-bonus note: an altoid tin fits perfectly in the inner pocket to hold a patch kit, tools or whatever you'd like!