What age group is this costume for?
Elementary School
Middle School
High School & Beyond

Estimated time required to make this costume:
A few hours

Difficulty level:
Quick and easy - no sewing required

Items you will need: (Hit your return key to start a new line)
Wanna be NSync? Well all you have to do is gather this:

Big Cardboard Box
Soap container
Faucet
(and anything, really, to make a box look like a sink)

Instructions:
Get box.
Cut it to make it look like a sink.
Glue soap, faucet handles, etc. to the sink (box).
Then get in the sink and add shoulder straps, like yarn/string, on your shoulders.