The Ortlieb SEAT-PACK 16.5L is a practical saddlebag that simply attaches to the saddle post with heavy-duty hook-and-loop fasteners, and doubles up as a mudguard for rough terrain.

Spacious and watertight, this saddlebag keeps spare items dry, while its volume can be adjusted between 8 and 16.5 liters by extending the roll-up closure. An additional valve makes it quick and easy to compress for an even more compact pannier.

Six centimeters of clearance are all that's needed for attachment to the saddle post.