Here's a nice parenthack for remembering to re-stock the diaper bag when you get home — and it'd work for any kind of kit-bag:
So, when you put a extra shirt or pair of pants into the diaper bag for those on-the-go changes, wrap them with a rubber band. First, it keeps your bag neat and it's easier to rummage around in there. Second, when you take the rubber band off to use the garment, put it on your wrist. That way, when you get home, you say to yourself, "what's this rubber band doing on my wrist?" You have a reminder to put new clean clothes into the bag!
How to remember to restock the diaper bag after you get home