Waterproof Rear Under Seat Bike Saddle Bag, Double Pouch Bicycle Tail Pocket with Reflective Strip for MTB Mountain City Road Bike Water Bottle/Repair Tools Kit

The straps that are attached to the seat post are plenty strong.The straps that goes over the seat rails slip badly.As a result the bag slides down the seat post until it hits the frame.For want of better latches this 4 star bag drops to a 2 star bag.I am left to wonder if they ever tested it with full water bottles.If the manufacturer reads this, please note that the rail straps are too thin for the latches (or buckles) that are used and the rail straps just slide through. If you fix this please send me a replacement.If not for that one flaw this bag would be very good!!!

I really like that I can carry both a water bottle AND an insulated travel mug, which holds hot drinks in winter and ice in summer! The zipper compartment is larger than the one on my road bike, which is nice because my spare MTB inner tube is really bulky. Tire levers, bike wrench set, small pump, hand sanitizer, CO2 cartridge, pressure gauge, patch kit, tube... it all fits with room to spare. Also note that the rear light holder is made for a clip-on light, but I cut a short piece of PVC pipe and it now holds a standard tube-mount light. I would have given it 5 stars if the water bottles were easier to get in and out of the pockets. They are really tight. I guess that might be good if you are on a really bumpy trail, but as they fit under the seat, I doubt if they would pop out if the pockets were a bit roomier. My suggestion to the manufacturer.... make the pockets a bit more roomier and add a heavier elastic material at he top edge of the pocket to keep things snug.

Was attached to a traditional road bike. Ineffective stitching/weak material doesn't hold up to the weight of two water bottles. Doesn't hold even a 20-oz water bottles well, having had a few things fall off the net. Didn't want the whole bag to drop along with my phone, wallet, etc., so I had to buy a different product. I would suggest another bag, IMHO. Waste of money...

This bag is a mid size seat bag for our tandem. The side pockets intended use for us is to stash cycling vest and/or finger gloves. The weight of full water bottle - especially TWO bottles as pictured - is a BIG STRETCH! If u need this size seat bag PLUS need to carry that much water - there are other ways to do this (Camelback). Nice zipper pocket for $$ and keys. Attaches to seat post with 2 Velcro wraps.

I only gave this item 4 stars because I'm short (5'1") and had to raise the seat a little for it to be properly installed. My husband is 6'4" and it works perfectly for him. Very easy to access and grab my bottle without physically getting off my bike. It hold bottles in place snuggly and the compartment will easily hold a large phone, a hand towel, sunblock and hand sanitizer.

I bike at least 2 hours a week and keep my bike in the shade inside my garage, but the bag still manages to starts to rip off. I do not carry water bottles full of water. I had some tools in case of flats or chain failures. The only reason I give it 2 stars is that it still holds. I would not recommend using it to put water bottles full of water or fully load the bags.

I’ve used this for a year and it’s holding up great. It holds my large 1 liter Zefal bottle with no problems.I zip it almost all the way shut with the two zippers and leave a small gap between the zippers to clip my red LED safety flasher.The little tab / reflector meant to clip a flasher to that is sewn onto the bag is not practical as it points the flasher down towards the ground so it cannot be seen very well by vehicles approaching from behind.

I was very excited to receive this bike bag for my long distant bike trip. However, much to my shagrin during my trip the clips that hold bag to bike frayed away from bag and I had to stop and pick it up off the road.