Last Ever Shuttle to Haul Raffaello Logistics Module to the International Space Station, Ken Kremer for SpaceRef

"The primary goal of the STS-135 flight is to haul the "Raffaello" multipurpose logistics module (MPLM) up to the International Space Station. The 21 foot long cylindrical module is mounted inside the shuttle cargo bay during launch and landing.

Raffaello is a space 'moving van' and loaded with some 12 tons of critical supplies, spare parts and science equipment to stock up the station before the shuttles are retired forever, despite the fact that they have many years of service life remaining."