I go on vacation and I take with me:

My backpack weighed 97-79.5 = 18.5 kg when I left. This was I tad more than I hoped, but it included 2 kilo's of supper for 11 people, which will be eaten :)

It all fits into my backpack (except the sleeping mat, but you can't see it on this picture 'cos it's on top).