The density of particles in Interplanetary space is about 10 atoms per cubic centimeter, mostly due to the solar wind. In intergalactic space, the density of matter is below 1 atom per cubic liter or about 10,000 times more rarified. Aside from that, this is the only LOCAL difference we know about for certain. Paradoxically, the stretching of intergalactic space would not appear as a local phenomenon, and the 1 liter box would always have exactly the same volume.