A backpack such as this one can be very useful for a number of things. This bag is made from nylon and you can put various small items in the inner pocket.
From Osprey Europe
Talon™ 36 - Eclipse Grey - L/XL
The product is available from £123.10 at international stores.
Trekkinn
Osprey Talon 36l Backpack Grey L-XL
OnBuy
Osprey Talon 36 Men's Hiking Backpack, Eclipse Grey, Large/X-Large