Nightrider rucksack the proviz nightrider 30 litre rucksack has been upgraded for 2016 a complete overhaul of the material has taken place to increase strength and durability the rucksack is now dual layer the outside material is tough 600d nylon coated with a pvc lining to give good water resistance the inner lining is 210d polyester which adds strength and gives a strong lightweight bag designed specifically to withstand the rigours of all outdoor activities the proviz nightrider rucksa