Don't get stranded.
This rectangular bag has enough space for even the largest tubular tire. Made of black Dupont Cordura for durability. Secure attachment with hook and loop strap around the seatpost and a webbing cinch strap with quick-release. The strap wraps over the zipper head to prevent accidental opening. Dual side pockets hold tools, money, etc. 3M reflective strap on the back doubles as a loop for mounting a strobe. 9"x4"x2", 92 cubic inch capacity. 4 Oz. Made in USA.
What you need for a road ride.