Today's key (June 19th) has been won.

Someonetookthenameiwanted was today's winner of the free key. He was the first to send us the code which was "gibus". It was hidden in the page footer and read "The word which will enrich a backpack this day is [gibus]". Congratulations to Someonetookthenameiwanted and good luck to everyone on tomorrow's free key (details here if you're new to all this).