Pannier bag seatpost bag rack pack saddle bag anzahl 1 material synthetica capacity 11 litres material properties dirt resistant water repellent safety features light attachment reflective print features bungee straps aluminum frame innenaufteilung main compartment outside pockets side compartment dimensions w x h x d 28 x 38 x 22 cm weight 985 g series rixen kaul contour load capacity 2 kg