I am one of the people who picks up the entries and deliver them to right person, at the right place, at the right time. Some bubble wrap around each bottle and into the right size cardboard box, or similar, with some packing to stop the bottles moving around is good.
I try my best to treat each entry with the upmost care. It becomes hard to do this if the entry/ entries have no protective wrap, are loose in a Coles plastic carry bag, falling over in a big box etc. etc.
We try to put them so they don't fall over, break etc. However this takes time which is in short supply pre comp.
However, please do not wrap each entry in several metres of bubble wrap and gaffer tape. Unwrapping these bottles takes lots of time and the bottle usually ends up shaken in the process.
Hope this helps.