Hydration Compatible - these are bags and packs that are hydration bladder compatible. They have special outlets and sleeves to allow for a bladder and tube. The shoulder straps also have attachments to secure the tube while moving.
Rain Cover - this product comes with a rain cover, which can be placed over the main body of the rucksack to keep your posessions dry in the event of rain. When not in use the rain cover can be stowed in an easy-access external pocket on the rucksack.
Water Bottle Pocket - Features one or more pockets for water bottles, allowing easy access to fluids at all times, without the need to rummage in the main compartment of the rucksack.
PFC Free - This product does not contain PFCs (Flurocarbons). PFCs are synthetic compounds with properties that make them suitable for manufacturing waterproof, non-stick and fireproof materials.