This hip pack is great for cycling, but could be a good short hike hip pack too. I upgraded to a larger pack last year. It is VX41 fabric in black camo colorway (bottom is black.  When the Cascadia's were being made (this pack is less than two years old) you could opt for modifications. I got this one with two water bottle pouches and with the Cobra buckle (which is expensive and a $40 add-on). I also ordered the adjustable straps on the top (removable) to hold extra stuff like my light jacket.The bag is very light (the buckle is probably the heaviest part) and has the following advertised dimensions: 12.5″ x 3″ x 5.5″ (LxWxH).  This was the biggest hip pack they made. This one has YKK zips and unlike earlier models, has the "waterproof" sealed type zips.  The back is slightly padded.  By the external dimensions listed, it is 206.25 cu inches or about 3.38 liters. Of course, these are approximations. YMMV