People, let's be careful when entering dimensions for parts. Over here in Canada, it makes a big difference if a part can fit under 18mm or not.
That part doesn't fit under 18mm and certainly doesn't have dimensions of 1.6cm x 3.2cm x 4cm :
http://www.brickowl.com/catalog/lego-transparent-purple-cocoon-3m-hole-4-85-11598The correction has been submitted... I'll have to spend a couple extra bucks for shipping an international order though. :-S