Getting a storage bag that suits your needs can be tough, especially if you're trying to hold enough stuff for longer rides/commutes, but you don't want a large bag weighing you down. The Louis Garneau Middle X-Race Cycling Bag is a great way to stow some extra stuff without adding too much weight or wind resistance. It straps onto any seat/seatpost, has hook and loop retention for an ideal fit, is made of ballistic material with a sealed zipper so it's durable and weather resistant and holds your tools, nutrition, and media close to your saddle where you won't even know it's there until you need something.
Micro-adjustable rail system to fit all kinds of saddles
Hook and loop retention system adds stability
Mini-light rubber tab to hang a light
600D fabric is light and weather resistant
Sealed zip and adjustable webbing for fit and added weather resistance