This is the Hyperlite Mountain Gear Stuff Pack 30. I bought it on a whim, but after reviewing my gear, I anticipate I won't be using it much, so I'm putting it up for sale. It's brand new, unused, and unopened, still in its original packaging. Capacity: 30L Weight: 125g Top Circumference: 81.28cm Bottom Circumference: 78.74cm Length (unrolled): 68.58cm Back Width: 25.4cm Material: DCF11 Dyneema® Composite Fabrics (formerly Cuben Fiber) Retail price in Japan: ¥25,300