Pannier bag rack pack anzahl 2 material polyester types ps 490 pd 620 coating pvc coated capacity 40 litres attachment quick lock 21 material properties waterproof safety features reflective print fastener roll closure features shoulder strap innenaufteilungen main compartment inner pockets dimensions w x h x d 32 x 42 x 17 cm weight 1 900 g colours grey black series ortlieb back roller