>>1193588I use picrelated which has a few advantages: No tapered opening, you can extend it (looks go out the window though), there's a little "lid in the lid" thing where you can put tiny things. Keep it stuffed with co2 canister, "pump", a tube, tire irons, patch and glue, multitool and a rag. Nice snug fit so no rattling.
You'll never catch me dead with a saddlebag. Looks like absolute ass. If I absolutely need the extra bottle (rare - it's never super hot here) I'll stuff my pockets instead.