Best way, go on to UPS or Fedex website and create a shipping label and print it off. One of the questions is "what are you shipping?"...I usually put down hot sauce or snow globes. This way if they hear any sloshing, it's not unusual. Then when you drop off at a shipping location, when it's already labeled, they don't ask anything. Competitive brewers have been doing this for years to send beers to comps around the country.