SEA TO SUMMIT Packable Attack Pack Approximately 6x9cm when packed in its bag. I believe it's about 20L. Use it as an attack pack for mountain climbing, a sub-bag for travel, or an eco-bag for everyday use. The hanging tag on the top of the pack is frayed on one side. See photos 7 and 8. There is no problem with using it on your back. I will fold it compactly and send it to you.