Large size saddlebag. Cotton duck with nylon straps. 23L
Inner waterproof lining closes with drawstring strap, allowing you to overfill your bag and still keep everything dry on those wet rides. Two button-close interior pockets and one slim zippered pocket that would fit an ipad or book. Two exterior side pockets are large enough to fit fat winter gloves, fruit, or tool kits. Reflective accents keep you visible in poor or dim conditions (like riding across misty moors or mystical meadows).
If you tend to carry a lot of heavy stuff, you might want to get an extra support, like the Carradice Bagman QR clamp