Best type of icing for a birthday cake?

[SquiffyHock]

I'm planning on making a cake for DD's birthday - it's a Wilton one where you ice them with lots of piped on stars (IYSWIM??), I've done it before with buttercream but when you wrap slices up to take home it gets very messy.

Is there something else I can use? I thought about ready made Royal icing but wasn't sure if it would harden while I pipe.
Does this make sense at all?? (Very befuddled brain tonight!)

Any suggestions gratefully received

[MOrticiaAdams]

Not really! How about buying cake boxes like the ones you can get for wedding cake. OR save the posh cake for visiting family and friends and buy a madiera cake for party bags!

[feedthegoat]

I've used the ready made icing before and found it only hardened slightly on the outer edge and stayed gooey inside. It was very fragile and if you touched it made a gooey mess anyway. Wasn't overly impressed but tbh can't remember brand.

[SquiffyHock]

Thanks both. It's only for a kiddies party so I don't really want to shell out on boxes and we have no family but the cake is big so I want to use it up.
I guess gooey, buttercreamy napkins is the order of the day! (None of them will care anyway, I really should listen to DH and just buy a cake...)