1.5-2 L Expandable Capacity: Expand for more capacity need; the key feature of our bike seat bag is its adjustable storage capacity, which can be expanded from 1.5 L to 2 L, allowing you to adjust it according to your needs at any time; the dimensions before expansion:9.6 x 4.1 x 4.3 inches ( L x W x H), after expansion: 11.4 x 4.1 x 4.3 inches ( L x W x H)
Water Resistant: Crafted from waterproof material, and reinforced with smooth 900D Oxford fabric and PU coating for rainproof protection; its sleek, fashionable look complements any cycling ensemble; furthermore, our bike bag does not contain PVC, ensuring safer and more reliable long-term usage; although the seat bag is made of water-resistant fabric, it is not recommended to use it for long periods of time in heavy rain
Multi-Compartment Storage: Equipped with a large main pocket and 2 mesh pockets inside the main pocket, this bicycle bag offers 2 L of total capacity for holding keys, wallets, gloves, mobile phone, bike tire repair tool kits, cycling accessories, etc; its thoughtful design ensures easy organization and access, making it ideal for securing tools, snacks, and more while on the go
Reflective Strap for Safety: Its reflective design significantly improves your visibility during night rides, offering an added layer of safety by making you more noticeable to others in low-light conditions
Easy to Install: With its strap-on design, this bike saddle bag allows for customizable positioning under any seat, fitting a broad spectrum of bikes, from electric to traditional; its adjustable straps ensure a secure and snug fit across various bicycle models, offering a stable and convenient storage solution for cyclists

Katy –
big bag
This bag is well-constructed and looks nice. I like that it doesn’t use velcro to attach to the seat itself, but rather buckles on. It is nicely water-proof and quite large so it could hold all the necessities. I think it might actually be a bit too large. The buckles to attach it are a bit awkwardly placed, almost like the designer thought my seat would be longer than it is. I wish that it had a clip for my car keys but I should have expected it not to have one as that isn’t in the product description.
Twin Citian (comprador verificado) –
Roomy and well made
Perfect seat back pouch. There’s a ton of room inside to place basic things when you go bike riding. Recommended.
Amazon Customer (comprador verificado) –
Good purchase and a great addition to my bike
Looks good and fits my Ozark trail ridge mountain bike Has the storage I need for slight breakdowns I also picked this bike bag because it offered more space/storage outside the bike frame, and doesn’t necessitate the need for a rear bike basket, and costs less than a basket. I’m satisfied with my purchase 😃
Fran (comprador verificado) –
Perfect, just one tiny thing
Only thing I would improve is the back strap is too loose for a back light mount, besides that it’s perfect.
Jeff D (comprador verificado) –
I can carry everything I need.
Great seat bag. I’m able to fit my electric pump, my backup manual pump, tire tool, tube and patch kit. All the essentials so I won’t get stranded anywhere.
Denis A (comprador verificado) –
Superb!
I was having a tough time finding a bag big enough to accommodate my phone but to not to stick way out from beneath my seat. My previous bag was so tight when I put in the phone, I thought that the zipper would burst from the tension. The Colefunmit bike seat bag accommodates my phone and other items easily without having to extend the bag, (which is nice feature to have in case you do need to add more items), and it doesn’t look bulky under the seat. Love it!
Bryan F (comprador verificado) –
Large capacity
Great bag with lots of capacity. Zippers work well, which was an issue on other bags
Bill S. (comprador verificado) –
UNDER SEAT BAG-SHIPS IN A BAG
Okay quality bag for the price point.It’s shape is why I purchased.Zippers are fair,at best.You have to be careful opening and closing,or you’ll break it.Here’s the real issue,item is shipped in a paper bag,absolutely NO PROTECTION ! So,rest easy,bag will arrive flat as a pancake.My first one,I couldn’t get it back to a usable shape,so I returned it.Second one,I filled with t shirts and let it sit,is good enough.Question is,why would you ship in a paper bag?The cost of a small box cannot be more than return shipping.