Either cardboard or the padded envelopes.They do make the non neoprene(foam) collapsible ones tho, but the neoprene would be a little more pricy but nicer I'd say.
Like a normal envelope with just a stamp?
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Barrell Roll!!!!X logo and a shadow ski backflippin is the usual and would be cool with me. Hardcore neon what ever color we go with.