GREGORY navy backpack, zulu30, with mesh back panel - Brand: GREGORY - Color: Navy - Model Name: Zulu 30 - Features: Mesh back panel - Storage Pockets: Side pockets Thank you for viewing. This is a GREGORY Zulu 30. The back length size is M/L. I purchased it on a certain flea market site, but I don't use it much, so I'm selling it. I think the condition is quite good for a used item. It comes with a rain cover. Thank you very much.