Use Royals and Eurekas that DON'T have the F&G bags-those clog and leak-harder to install.Sometimes the paper bag fill tube can tear if the vacuum picks up something hard or sharp.Don't use the F&G "bojack" bag on a Kirby-you will hinder its performance.Hoover Convertables are excellent vintage machines-despite the simple "C" bag-performance is excellent.Canisters I would go as many do-vintage 'Lux,older metal body Filter Queen,Compact-Tristar,Older Royal metal "torpedo" tank vacuums,Rainbows,Fairfax-don't overlook those.Water Matics are another one-like a Filter Queen but can be adapted to wet pickup.