Pannier bag seatpost bag rack pack saddle bag anzahl 1 material synthetica capacity 4 litres attachment klickfix material properties dirt resistant water repellent safety features light attachment reflective print fastener zip innenaufteilung main compartment outside pockets side compartment dimensions w x h x d 15 x 28 x 14 cm weight 450 g series rixen kaul contour load capacity 2 kg