A perfect backpack for your hike! It is made from several materials, including polyester, and things you want to keep extra track of can go in the inner pocket.
From Amazon
Vaude Brenta 44+6 Backpack >=50L - Blue Sapphire, One Size
The product is available from £117.93 at international stores.
Trekkinn
Vaude Tents Brenta 44+6l Backpack Blue
Hardloop
Vaude Brenta 44+6 - Hiking backpack Blue Sapphire 44 + 6 L