Just the right size
I've got 2 other Sigg 1L bottles that I use for hiking when I don't have to worry about weight (I'd use Platypus if I do). But it's the 0.6L that I use on a daily basis. It's just the right size to fit in car's cup holder, and small enough to put in my messenger when I go off to conferences, and hold just the right amount of water while I'm in my cube working - give me an excuse to get my butt off the chair to go top it off. I love the iconic design and the Swiss quality. All the other bottles in the market are just imitating the original.