Thousands of travellers passing through Australian airports weekly are having their luggage plastic wrapped in the wake of the Schapelle Corby furore.

Trade at luggage-protection business Protectabag, set up in Brisbane and Melbourne international airports by Dennis and Julie Gyde, has more than doubled in recent months because of travellers' fears of being used as unwitting drug couriers.

Gyde said for $8 an item, travellers enjoyed "peace of mind" knowing their luggage, including golf clubs, prams and baby seats, was covered with several layers of shrink-wrap using a purpose-built machine.

Gyde said he was negotiating to bring the service, that covers luggage before it reaches the check-in counters, to Sydney, Adelaide, Perth, Canberra and Cairns airports.

He said customers remarked daily about Corby, who was sentenced to 20 years in jail by a Bali court yesterday after she was caught with 4.1kg of marijuana in her bodyboard bag at Denpasar airport on October 8 last year.

Corby's lawyers claimed she was the victim of a botched domestic trafficking operation involving Brisbane baggage handlers planting cannabis for pick-up in Sydney.

"In the last six months, particularly the last three to four months, there has been greater awareness and the reason for this is obviously surrounding the affairs in Bali," Gyde said.

"Plastic luggage wrapping has been around the world for years ... perhaps in the early days many people thought there wasn't a risk here but now it's in their minds that there is a risk."

He and his wife introduced the system to Australia two and a half years ago after they saw it in Italy.

"We completely seal the luggage and all zips, pockets and straps with stretch plastic wrap but we bring out the handles and wheels," he said.

"It has an advantage over padlocks because the most common point of entry is through the teeth of the zipper, with a ballpoint pen or wire, that can be rezipped.

"But once the plastic is pierced it is obvious so people can pick up their luggage at the carousal and know with the plastic if it hasn't been touched."

He said the method also offered protection against theft and handling damage.