BV Bicycle Strap-On Saddle Bag with perfect Size I With reflective for a Safety ride I Seat Bag, Cycling Bag - Bike Bag for all our essentials, bike bags for bicycles, bike seat bag

I bought this because I like the style and functionality of it. I originally bought the medium sized one, but returned it because it was much smaller than expected. I bought the large unit and it’s better but still a little smaller than I would prefer. I’m going to keep it because, I like the design and the size is OK for the majority of things that I carry. This is replacing one that I had for 20 years which I was able to put my lock in. This one is too small to store my lock, but I can attach the bike lock , somewhere else on the bike. It seems to be well built. Zippers are good quality. I gave it three stars for water resistance only because I have no idea how well it resists water. The mounting system holds the bag in place securely; however, it took some time for me to figure out exactly how to attach it to the bike. The bag didn’t come with any instructions regarding how to attach it, but but because I’ve had a bike bag in the past, I had an idea of how to attach it. For someone who’s never attached back like this under their seat before, they may find it difficult. I’m sure there’s a video on YouTube that shows how to attach it. Overall, I’m happy with the product.

If you're going on long rides, you're going to want to carry those essential tools to prevent yourself from getting stranded. If you're on a road bike keeping it light you're not going to want a huge bag like on a touring bike. You're not going to want to carry all those tools in your jersey either. There's enough stuff in those pockets already. An under-saddle bag is the solution, and that's what this is. Maybe there's a better one out there, but this one has worked for me with several years with no signs of wearing out. I also can't imagine what there is to improve upon.First, it has enough storage capacity for everything I need on the road. Tubes, CO2, levers, tools, patch kit, everything. It's a bit cramped, but it all fits and zips closed no problem. You can also undo one zipper to increase the capacity a bit if things are really tight.I'm not sure if it's technically water proof or water resistant, but I have been caught in the rain a few times, and nothing in the bag has ever gotten wet.It straps on to the bicycle very securely and tightly. It is very easy to take it off and put it back on, for example when I'm cleaning the bike. When secured properly it doesn't wobble or anything. I don't even realize it's there while I'm riding.On top of all that, it has a little tab on the back. My red rear light clips onto that tab perfectly. Pretty sure that's intentional, but it's still a great feature.If you need a saddle bag on your bike, and you can't find something even better, you should have no concerns about buying this one.

Got the small size and it fits well under my Trek 7.3 hybrid bike, even with the seat in the forward most position, and maybe sticks out half an inch to an inch as in the photo. It is just large and long enough to hold a galaxy s4 smartphone with a case on it, and I could probably get a spare tube, small co2 inflator, and spare cartridge along with a multitool and car keys in there as well to cover basic necessities to help with a flat.The quality of the product seems very good and it seems thick and durable and not cheaply made at all. The slot to put a rear light on does point downward sharply, which is a bit annoying, but it still seems visible, or you can attach it directly underneath the bag on the seat tube as well.I do wish the plastic clip that you loop through the underside of the seat to secure it had the clip on either side of the seat instead of on the top of the bag, as it makes it very difficult to tighten fully and clip so that it sits snugly directly below the seat and not hanging down an inch or so. By the time you shorten the adjustable portion of the clip all the way, you have no room to work to connect it underneath the seat as the bag is in the way. Having the fixed portion of the clip on the side would make this way easier, but once you get adjusted properly its secure, and the velcro strap that goes around the seat tube seems secure as well.Great size for bare necessities that will also fit a modern smartphone and a few other essentials, without being bulky or overkill.