The first product in my upcoming line of sleep systems, the Bend Alpha sleeping bag liner is made from USA-made Polartec 60gsm Alpha Direct fabric. As far as I know this is the only Alpha bag liner on the market, and most likely the highest warmth to weight bag liner in the world. The long weighs about 7.5 ounces, and the regular about 6.5 ounces. Packed size is about 4x4x6 inches. That's all fantastic but here's why we are so jazzed about this liner: the vertical insulation fibers trap just a ton of air for the weight of the fabric, wrapping your body with a 3mm layer of insulating air. With normal sheet fabrics there isn't a way to do this without a bunch more weight and bulk.
 
We have tested this liner extensively. It is super, super comfortable even on bare skin. You barely even know its in your pack. It packs an impressive punch of warmth we found to be between 5-10 extra degrees of comfort. Its a great stand-alone ultralight sleeping bag for hot weather. Its a great cacoon to use for daytime naps. It launders easily and dries very quickly.
 
Designed with a wide-mouth opening with cinchable elastic drawstring for both ease of entry/exit AND to maximize warmth. Liner is designed to cinch just above your shoulders and not go over your head. I did this for a couple reasons: One is it would require a bunch more fabric adding to weight, bulk and cost. Two, its super hard to get a bag liner to GO over your head because your body is pinning it down.
 
Colors will vary based on availability of fabric, but right now it is this deep red. 
 
Designed, cut, sewn and shipped to you from Bend, Oregon. 
 
LONG recommended for users over 5'11"
REGULAR for everyone else
 
Item is made to order and ships within one week of order placement. 
 
Includes a hand-made ripstop nylon stuff sack.