Depends where its going?
Internal or National should be ok with plenty of wrapping and disguising. Spraying with perfume or putting pot puri in jiffy bags is just asking for some one to open it.
International... Its up to you but its alot more risky.
Id suggest plenty of cling film round the bud, washing your hands and repeating. Put in the smell proof bag, Then in a small box sealed with plenty of tape, sealing all edges so no gaps are visible. Id do this a few times, if I was gonna do it.
Try make it look as least inconspicuos as possible.
Who ever said dogs can smell thru three layers of steel has been misinformed, I watched a documentary on a bloke that cut a womans head off in his bathroom, Hacked the rest up and wrapped her body parts in cling film. He then put the parts in his loft and cleaned his bathroom. When the police did forensics on his house, he had wrapped the body and cleaned the bathroom so well they couldnt find No Trace... The only reason they got him was cus he had wrote a poem about it that was under his sink and then he confessed to it, telling them where the bits were.