Review on NDakter Bike Pouch: Versatile Water-Resistant Triangle Storage Bag for Road and Mountain Bikes - Perfect for Phone, Wallet, Keys, and Tools by Matt Simpsons

I wasn't sure if it would fit my mountain bike as all bikes are made and styled differently but this bag did. It fits securely and comfortably in the corner of my bike that is almost directly under my seat. Velcro straps are a lot stronger than I thought and the zipper will never budge even if you don't pull it all the way up. Although I was initially apprehensive, this bag stayed attached and kept everything safe and sound after overcoming bumps, mud and all sorts of twists and turns and stops. There is a pocket that comfortably fits my phone and I was able to fit my portable tire pump in there. I've ridden through the mud several times with this bag and even walked into numerous puddles. Even when it gets wet and dirty, this bag keeps everything in me dry and clean. When I get home I can easily wash off the dirt and if necessary wash it in the washing machine, I just let it dry. Great bag and I'm glad everything is safe and secure in it.