Your patch kit deserves the very best, and that’s why you need a deluxe seat bag made from ballistic nylon, with a full liner.
Holds a full complement of inner tubes and tools, or wallet, snacks, etc. — 65 cubic inches of cargo, until you unzip the expanding bottom. Then stand back, you have 81 cubic inches for that extra load you hadn’t planned on, and don’t want to stuff into your pants pockets.
Use the loop to attach a safety light.