This is the most ergonomic small and medium backpack I have ever carried in over 30 years of backpacking. The shoulder straps are unpadded and yet super comfortable. It is made entirely of recycled plastics woven into luxurious and tough fabric. No kidding. The webbing is made from recycled soda bottles. It won BACKPACKER Magazines Editor's Choice in its catagory in 1994. I got mine thru the American Hiking Society because it was featured with a discount for members. It has a basic tear drop shape,… Full review
Ecotrek dissolved in 1997. Ecotrek's Biospan technology is now being featured in Marmot backpacks.