re the debate about backpacks

i also now a big fan of the camelback system

i bought a cameback hawg a few years ago

3litres of liquids is great plus you tend to drink more on the go

ive found you drink little and often which is better for hydration
rather than with waterbottles which i found was that i took a swig when i was really thirsty

the advantage also of the cameback system is that it is just the right size ....ie on a summer day on the tandem 3 litres and a coupla bananas and a waterproof jkt i live in scotland so you can never be to careful...

re using the cameback in winter conditions and probs with icing up

you can get a
cover for the tube and mouthpiece this also keeps the water cool in the tube in the summer

ice cubes in the camelback are also a good idea

i hope this info is helpful
and no i dont work for cameback lol