You close this running backpack with a zipper. The material of choice for this bag is polyamide and it holds 12 litres.
From Ellis Brigham
Salomon ADV Skin 12 Vest - Goji Berry/Ebony L
Trekkinn
Salomon Adv Skin 12 With Flasks Hydration Vest Red L
Physio Room
Salomon ADV Skin 12 Vest - Goji Berry/Ebony L