Let's eliminate IATA's "CabinOK" program!

First, they came for our free checked baggage. And now, airlines may be zeroing in on our carry-ons.

The International Air Transport Association, a trade association for air travel companies that include airlines and aircraft manufacturers, announced a new guideline on Tuesday that recommends smaller carry-on size limits, so that overhead bins will become less crowded.

Under current regulations, American Airlines, Delta Air Lines, and United Airlines allow carry-on bags up to 22 inches by 14 inches by nine inches. The new guideline, however, wants to reduce the "optimal" size of carry-on bags to 21.5 inches by 13.5 inches by 7.5 inches.

If the new guidelines are implemented, travelers may need to bring smaller bags, buy new carry-on bags, or pay to check their suitcases.

Travelers will need to re-think their packing strategy as a result of IATA's CabinOK guidelines.