I have used the Stash bottle from Hydrapak [1] for a few years now, that one is the definition of light, and very versatile. The interesting thing is that the opening fits the filter by Katadin made for their BeFree bottles [2], so you could even take that on hikes where you are not entirely sure of the water quality (filters particles and bacteria, but not viruses). I actually carry and use this combo, not related to the companies.
