
Outdoorenthusiasts.com said "The stand out feature from this hydration pack is the hole in the middle which keeps the width of the reservoir below 3.5 cm thick. This means the pack doesn’t balloon out too much taking up too much room in your pack, which is a key problem with many other hydration packs."
The cut out isn’t the only clever design feature; the patented Widepac technology allows you to open the reservoir at the top to fill rather than the traditional screw top. A red plastic clip slides over the top of the pack sealing the liquid in. This means you able to fill it right to the top, get into the pack to easily clean it out and also pop items in such as ice cubes.
"Overall a great product from Source Great for anyone looking for a smaller sized hydration pack. When not it use it folds down into a small size. It’s not only going to keep you hydrated but it also leaves plenty of room for gear in your bag."
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