A great surprise Discardian tip appeared in my Flickr pictures from my contacts from the wise Reverend Dan Catt. Have a look at his fine diagram of finding the magic point of agreement on a point of domestic discord.
So, when you're working on Keeping The House Tidy and there's something that one of you thinks is often in the wrong place, try each making a list of acceptable locations. With any luck you'll already have some place in mind that turns out to be fine with you both. Venn diagram optional.
(Advanced tip: notice that this technique can be used with other kinds of disagreement besides rucksack storage as well…)