I think its actually better to not get the head at WDW because the box is only so big.. I think my daughter is going to get another box this time of things to go with the pieces she got last time.. she also already had a Mr Potato head so she didnt have to get one while there.. Its hard to say exactly how many pieces you can fit in the box because it depends on what you get.. there are some items that are quite big so if you get several of those items it will limit the other thing you can fit..
She got 35 things.. this is what she got:
Mermaid Hair (big)
Mickey mouse feet (big)
girls feet (big).. (not sure whose these were to be though)
Donald Duck beak (fairly big)
Minnie Mouse Safari hat with ears (medium size)
Goofy Hat with ears (medium size)
Donadl Hat (medium size)
Micky Sorcerer hat with ears (medium size)
Mickey Ears hat (medium size)
2 mickey hands
Minnie Mouse Bow
Mickey balloon on a stick
Star wand
Autograph book with mickey pen attached
Pair of earrings
Pair of ears
Pair of Mickey glasses
Mickey Mouse clock
Mickey Icecream bar
Disneyworld/
Disneyland suitcase
4 pairs of eyes
4 mouths
2 noses
1 left and 1 right arm (important to get because they specifically hold the items)
Not too bad for $18.. we really stuffed that box.. You may have to move things around a bit to get them to fit just right so you can get more items.. I think only 1 thing wouldnt fit that she wanted and it was pretty big, so we put it back..