One of the closure mechanisms on this hiking backpack is a buckle, drawstring, and zipper. One of the materials used to make this bag is polyester and it has a volume of 27 litres.
From Wardow
Deuter Futura 27 Hiking backpack dark grey
The product is available from £93.10 at international stores.
Hardloop
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Trekkinn
Deuter Futura 27l Backpack Grey