KENNEDY SPACE CENTER, Fla. -- At SPACEHAB in Cape Canaveral, Fla., members of the STS-107 crew pose outside of the Double Module, one of the mission payloads. From left to right are Mission Specialist David Brown, Commander Rick D. Husband, Pilot William "Willie" McCool and Payload Specialist Ilan Ramon, from Israel. A research mission, the mission will be the first flight of the Double Module and will also carry a Hitchhiker payload. The experiments range from material sciences to life sciences (many rats). The Hitchhiker carrier system is modular and expandable in accordance with payload requirements. Hitchhiker experiments are housed in canisters or attached to mounting plates. The Hitchhiker canister comes in two varieties--the Hitchhiker Motorized Door Canister and the Sealed Canisters KSC-01pp1693