Nalgene
Nalgene bottles are available in a wide mouth version, ideal for popping ice cubes in, and narrow mouth versions, ideal for drinking without spilling. The copolyester that the bottles are made out of is impact resistant and dishwasher safe. Several other companies, including Camelback, make similar bottles. These bottles are often available in 16 oz., 32 oz. and 48 oz. sizes.
Personal Hydration Systems
While Camelback was the first, several other companies, including Platypus, now make personal hydration systems. These have a large bag that holds the water, usually 32 oz. to 64 oz., and a hose that extends from the bag with a bite valve on the end. A hiker simply clips the hose to their backpack and, when they need a drink, bites down on the valve and sucks water out. These systems have improved significantly in the last few years and are much less prone to leaking.
Insulated water bottles
While you can buy insulation jackets for Nalgene bottles to keep water hot or cold, several companies, such as Sigg and Laken, have developed aluminum bottles that are double walled and act as insulation bottles. They are reasonably lightweight and perform well under a variety of conditions.
