Camp Master - NFLATABLE AIR BED DOUBLE

Be aware when you purchase a Camp Master INFLATABLE AIR BED DOUBLE. They stated that the product size is: 191 (L) X 137 (W) X 25 (H) cm

I purchase one at MAKRO and after inflated it fully the actual size : 184 (L) X 130 (W) X 20 (H)

if you calculate the volume (cm3), there is 175 775 cm3 missing.