I’ve had a Camelback in the past and it fell to pieces within a year, so needing a new one and not wanting to spend a fortune I bought one of these

http://www.decathlon.co.uk/700-hydration-pack-blue-id_8327933.html

I’m really pleased with it, really well made and super comfortable.

Just in case anyone’s looking for a cheap light backpack I’d fully recommend this one.