Scicon makes some killer saddle bags in all shapes and sizes for everyone from the over-packer to the weight weenie. The Scicon Round Medium 700 fits right into the middle ground. It gives you plenty of room for the essentials and then some without looking like you have an overseas steamer trunk strapped to your saddle.
Durable Cordura nylon construction stands up to the abuse of long distance riding
Water-resistant zipper helps keep your stuff nice and dry
Contact System attachment uses a clamp that attaches to your saddle rails, and a quick release clip on the bag, so mounting and removing the bag is a breeze
700cc of storage space gives you enough room for tools, tube, pump, cellphone, keys, wallet and nutrition