External link to an ultralight guide from DeputySean.
All tagged Pack weight
In defense of a Nalgene: why a Nalgene can be a good hiking water bottle
Smart water bottles are great but a Nalgene is better if you can afford the weight.
Extreme minimilist packing
For all who are aspiring to pack lighter check out this guy who traveled to a tropical area for a whole season with nothing more then a 14 liter pack.