For cue sheets, get a cueclip (www.cueclip.com). I wrap mine arind the top of the stem. Fold your cuesheet up so you can see the turns to the next control, put in a ziploc sandwich baggie and fasten it with the cueclip.

Put your brevet card in another baggie.

If you get a B17 saddle, which I do recommend, then try a Carradice saddlebag. I use The Pendel model for short rides, and the Camper Longflap for touring. I also use a small frontbag from Frost River (www.frostriver.com) for easy access to food while riding. Rivendell sells the same bag that they call a "candy bar" bag (www.rivbike.com). None of these bags is what would be considered lightweight, but Randoneurring is not a race.