This backpack has a 45L capacity and adjustable straps for a comfortable fit. - Brand: THE NORTH FACE - Model Name: tellus 45 - Color: Clay Grey - Capacity: 45L - Size: L Thank you for viewing. I purchased this for overseas travel and used it about twice. It's in relatively good condition. Depending on the airline, I used it as a carry-on. The back length is size L. I am 175cm tall with an average build, and it fit me comfortably.