I designed this pack for use on the Tour Divide Bikepacking Race. I carried the orginal during the 2017 race. This pack is under one pound, 500 grams, and is built in any back length for a perfect fit.
Fabrics are Xpack VX42,VX07, D40 (on the bottom), and 200D Spectra ripstop in body. The shoulder straps, back panel and waist belt are 5mm spacer mesh for breathabilty and fast drying. The waist belt is a combination of spacer mesh and a durable strech woven fabric that allows the belt to strech and move with your body. the shoulder staps a have a thin, 1/4" (6mm), closed cell foam layer in the middle to help support the weight of a full load of water and food.
It can be rolled up and stored on the top of a seat bag if you don't need the overflow space. I use it to carry extra water,food and a layer or two depending on the weather. this way I never really needed to get into my closed bags during days of rain and/or snow.
This isn't a hydration pack. There is no hose port. I used it to carry water in my MSR water bag and refilled my bottles. I can sew a clip for the MSR DromLite water bags if desired.
Sizing: available in back lengths 13"-23". shorter packs will be slightly deeper front to back to add some volume.
Colors: main body is black ripstop with white(spectra fiber), white bottom (D40). top zippered panel can be a custom color: black, navy blue,red,grey,yellow VX21 fabric.
weight: 19" pack is 14 ounces.