This rack is not only extremely useful when it's installed on the bike (for strapping your stuff to), it also disassembles flat so you can stow it if you're travelling with your bike. The uprights are removable. It's a stainless steel rack with aluminium stays.
Comes with four stays - if you use two, it's rated to 5.4kg, if you use all four, it's rated to 7.7kg.
Weighs 708g, and the platform is 27.5 x 20.3cm.