A perfect backpack for your hike! The material of choice for this bag is synthetic material and you can put various small items in the inner pocket.
From Amazon
Tatonka Norix 48 Touring Backpack - Lightweight Backpack with Front Access, Adjustable Carrying System, Base Compartment and Rain Cover - 48 Litres - 70 x 29 x 20 cm
The product is available from £111.14 at international stores.
Trekkinn
Tatonka Norix 48l Backpack Black