shawkins
Adventurer
I picked one of the 1.5L bottles up yesterday at Sportsmans Warehouse and I think they are pretty cool. They are made out of alluminum (I think, lol) and are pretty darn light. I would say my 1.5L bottle is lighter than a standard size Nalgene.
Check them out at: http://www.sigg.ch/
Check them out at: http://www.sigg.ch/