I posted (and ordered) a Gelert Hydration pack from Amazon the other day that went hot.
Unfortunately they cancelled the order this week.
All the usual bike shops have basic models for £20 or so with less storage than this.
Just bought one of these for £10.70 instore in Bournemouth Tesco, they are online too but with a rip off postage charge of £4.70.
It looks much better in the fabric as it were than the photo.
This hydration rucksack has a capacity of 6L, iincluding a compartment that will allow you to carry a 1.5L water bottle. The rucksack has been designed to fit snugly around your body so that you do not have to stop if you wish to have a drink. It is ideal for walking, biking and skiing. It is lightweight and durable and has reflective trims for added safety in poor light.
Features of Product Drink without stopping.
Fits snugly against body allowing you to carry your drink in comfort.
Ideal for walking, biking, skiing.
Lightweight and durable.
Reflective trims for safety in low light conditions.
6 litre bag capacity (inc 1.5 litre water holder)
Material 600D polyester with diamond ripstop trim.
Product Depth 12 cm
Product Height 43 cm
Product Width 18 cm