Got many years out of the Robert Beckman 'needleworks' bags I got in the middle of the 80's, still going strong..
He and Bruce Gordon were both in Eugene and co operating, so they fit Bruce's racks perfectly.

I got some beefy rain covers made front one has a big flap , because I like Paper Maps and needed a place to stow them,
Back cover, in one cap covers both bags and the rack top load too.