If your mountain bike has room for water bottles and you're looking to join the "ditch the pack" movement, you'll still need something to stow your flat fixing materials, tools, and other essentials. Fox Racing lets you hit the trails and carry almost everything you might need on your ride with its Large Seat Bag. Fox designed the Large Seat Bag with an expandable zipper at the bottom that allows for more room when you need it and it can zip up, creating a smaller profile, when you don't. It's large enough to hold two inner tubes, a multi-tool, a quick snack, and other essentials like your keys. PU coated, 600D polyester construction offers durability and enough weather resistance to keep wheel spray from harming your contents inside. A low-profile slim design easily fits under the saddle and attaches to the rails and post with quick attaching hook and loop straps.