We bring a toothbrush holder to put on the counter for toothbrushes (we also put the covers on the bristles)
a suction cup basket for the shower since there never seems to be enough room for the various things 2 people need in the shower let alone 5.
the 3 girls and I use the same shampoo, conditioner and soap on vacation so we don't have as many bottles
we put 2 of the LARGE command hooks near the door for lanyards - and the lanyards have our KTTW cards in them also.
Pop Up hampers - 4 of them, one for whites, one for jeans 2 for darks (girls and ours) OR I'll just use the various empty suitcases, it depends on the storage space for the suitcases, the hampers take up less space then the suitcases do.
One suitcase is always for shoes.
plastic pouch type folder to put the days paper goodies in - park maps, resort info, etc. reciepts go in the Passporter.
a surge protector. (or 2) Keeps all of our various plug in things in one location - cell phone chargers, camera chargers, game boy chargers, laptops....
each kid has a bag for their stuff, we usually hang them on hangers in the closet, but I like the idea to hang them from the bed posts if there are posts. That would make it easier for the smaller kids.
My oldest & I use a tolietry bag when we travel alone, but the over the door shoe holder is great when it's all of us.
suction hooks for hanging swimsuits in the tub if we travel during weather that we can tolerate swimming in.
I bag all the girls outfits by day in a gallon ziploc and include hair accessories and any jewelry. for Dh and I I fold our outfits together, under garmets and socks get folded inside the shirt which is folded around the pants/skirt. then each person has a drawer - or shelf- of their own.
I like the small drawer idea though for accessories. my oldests clothes, particularly in winter are getting a bit much for a gallon bag.