Hi there! Quick question... Do you think I can mail two tiny plastic bottles ( I think they're about 3 ml bottles, each half full, so about 3ml liquid total) in a greeting card envelope? I'm supposed to mail swap today, and just realized someone used the last padded envelope. Will that work, you think? They're wrapped in foam, in mini ziplocks. Think that'll be ok with about 4 stamps? rofl Nothing like waiting till the last minute and encountering a snag. Thanks for help!