The North Face Pack Rain Cover

"The Pack Rain Cover from The North Face is the essential accessory for all outdoorenthusiasts who want to be well equipped on their hikes. This cleverly designed rain cover is fully seam-sealed and therefore offers optimum protection against water ingress, even during unexpected rain showers. Thanks to the elastic fastener, the rain cover can be quickly and easily pulled over the backpack, which is particularly advantageous in the event of sudden changes in the weather."
"Equipped with a durable water-repellent DWR treatment, the shell reliably protects your backpack from light moisture and prevents the fabric from soaking through. A clever detail is the drainage opening, which prevents water from accumulating. The sleeve is also hydration bladder-compatible and can be completely stowed away inside itself, saving valuable space in your rucksack."
"The Pack Rain Cover scores points with its lightweight material, which is perfect for all activities where weight plays a role. The screen-printed logo gives the cover a stylish look. With a choice of different sizes, from XS to XL, it fits almost any backpack and is a must-have for every hike."