The U.S. Open is golf's toughest test, and the best players in the world have to do things in their bags that may look a little weird.

Best bivvy bag wild camping: compact shelters made for one - Need a single-occupancy solution for a cross-country adventure?

To avoid the frustration of confiscation at the airport, an experienced cabin crew expert is warning frequent flyers against packing these peculiar possessions in their bags.