Originally Posted by
greengage
The original bags on those bikes were some kind of vinyl, cloth-faced on the interior with thinnish leather straps--not fancy at all but pretty sturdy. I can't believe the prices they're fetching on eBay. So yes, I'd love to hear more about the $10 alternative!
My '73 Sports came with an original bag, made from "oilskin" material" like greenpage described. The leather straps were both quite worn and destined to break at the most in-opportune time. I had a shoe repair shop fab a couple of new leather straps using the originals as samples. Cost about $10 and the
bag is as good as new as seen below.