Matador
There are other ultra light backpack lines out there, but none so packable as Matador. And Matador makes their ultra light packs even more versatile by using waterproof fabric, sealed seam construction, and water resistant zippers for their Freerain 24 waterproof packable backpack, Freefly 16 and Daylight 16 packable backpacks, Packable Hip Pack, and Transit30 packable duffel bag. Based in Boulder where they should be.