1. Grip C14 (16 discs) my day bag / go to bag, most commonly used.
2. Grip C15 (16 discs) my GLOW bag, any night time rounds.
Purchased the Zuca/DD Backpack cart which easily fits either Grip bag. Easy to swap them in/out or just remove and go backpack only for those fun, cart-unfriendly courses. Use this for slower rounds like tournaments or mobbin' league play.
3. NutSac (4-5 discs) for quick solo rounds and practice. Works great for snagging a few discs to get around the course quickly when night arrives soon after work. Usually distance driver, fairway, midrange and putter. Or for putting practice and upshot work, pack in 3-4 putters and head out to course.
Also keep a plastic bin in the car full of disc golf supplies that may be course specific. Gator and Retriever for water courses, bug spray, sun blocker, towels, etc... Prefer to pack light on the course so only bring what I think I will need and leave the rest in the car.