How much can you fit into a 33 cubic inch seat bag? The road essentials: spare tube, tire levers, mini tool. Also some spare change. And your keyring too (as long as you’re not a building superintendent or someone like that). Made from ballistic nylon, with a full liner.
Minimalists and neat freaks will love this. The rest of us may need something bigger, like the Banjo Brothers Deluxe Medium Seat Bag.