Old Claud Butler musette. Looks to be canvass with some sort of rubberized material on the inside. No rips and the strap is intact. I've had this for years. My guess is it dates from 40's-50's App size 13"x 10" but you can see the size in the pictures. This is a must have for a British Bicycle Collector.
I will ship this at the cost of shipping. $125 Email Chuck