I have two Granite Gear Aquatherm water bottle insulators (blue). They fit both 1-liter and 1.5-liter Nalgene water bottles and have a daisy chain sewn on for attachment to your pack. I'm not sure of the weight, but they are reasonably lightweight. I'd like to sell them as a set for $20 + shipping. PayPal Gift / CONUS. Send inquiries to [email protected]