mark a. said:IIRC, glass does a fairly good job of absorbing UV anyway. There are coatings that increase UV absorption to prevent it getting through to the delicate liquids inside. No idea whether such bottles exist, though.
So perhaps for general use, and not for long-term storage, clear bottles are fine.
The ultralight backpackers tend to use normal water bottles (e.g. Evian etc) as they're very light and actually fairly leak-proof. You probably don't always need super-strong Army-issue bomb-proof ones if you're not doing anything too strenuous.
I've given up using my alu bottles and nalgene bottles in favour of a couple of 1 litre, narrow necked mineral water bottles (new set whenever you want for price of the water) - reason? - because they are slender at the neck you can shove them in your backpack (lid down) down the middle of your bivi bag/sleeping bag/tarp etc really easily - not had one leak yet - they are pretty strong. I have has a platypus bladder explode, conveniantly, at the beginning of a three peaks walk (yorkshire)!.