ROCKBROS Bike Saddle Bag Small Seat Bag Bicycle Bag Under Seat Bike Accessories Storage Pouch Ultralight Cycling Wedge Pack for Road Mountain MTB Foldable Bike

Super small. Like fits an extra tube that is taken out of the box. If you need uber small, this is for you!

This Rock Bros under-seat bag is great! I have read some criticizing its size...IT'S SUPPOSED TO BE SMALL!! It is perfect for your go-to tire flat fix bag. It is almost tear-drop shaped so that it tucks up under the seat oh so well. In mine I hold: (1) 700x25 inner tube, 1 nozzle for CO2 cartridges (2 of those as well-each 16g,) 3 tire levers, and 3 allen wrenches for all the sized bolts, etc. that my Giant road bike might need. From the photos I supplied you can see how well it tucks under the seat, allowing for rear light underneath it that really lights up the reflective bottom of the bag as well. There is a little tab on the back that allows for another reflector to be hung, but I wasn't able to find one that looked and fitted well, so the round bag reflector already there does a good enough job for me. The affixing velcro tabs were a bit long (better that than too short...) so I used scissors and cut them down to size! This bag is meant to be for a job like I am giving it. I hope to never have to open it. It looks great and provides reflection as a bonus. I have a different bag up front for cell phone, keys, i.d., and power bars. It would be a disaster to have to reach around back while on the bike to retrieve such things! If you are looking for a minimalist bag to carry what I have described on your road bike, this is for you...

This bag is the perfect size for packing a spare tube, CO2, and tire wrenches. But, as one of the previous reviewers noted, the bag unzips itself during a ride. I've taped it shut, but that seems like a serious design flaw. As an update, ROCKBROS got in touch with me and offered a full refund, which was really nice. So, I'll upgrade my review by a star.

Good bag. Sleek but fits tire and tools.

Not a huge bag to ride along with you but perfect for the keys to your vehicle that you drove in, a bit of money for a stop to buy a drink along your ride and room for an extra power or protein bar you may want to bring.

I really like this bag. I have been using it for a few years on both my gravel and road bike. It's perfect for your basic tools: inner tube (I'd say up to 700c - 47), 2 tire levers, mini tool, tire plug kit. And it's minimalist in weight. Great bag!

The bag is the perfect size for a mountain bike tire repair kit (tire levers, puncture kit (if tubless), a few cannisters and room leftover. I love the size - BUT - the straps won't hold on the MTB ride. You have to use another velcro strap that's long enough or zip ties. So the extra work to keep it on the bike is worth it. Now, I have another Rockbros bag for my gravel bike that's larger and those straps haven't moved in two years. This is just a smaller bag, smaller straps, not enough grip. Its ok, just get a long zip tie and you'll be fine.

It is VERY small.