Small knives will soon again be allowed on passengers airplanes for the first time since the September 11th attacks.
Transportation Security Administration chief John Pistole announced the security changes Tuesday.
While the rules are being relaxed, the agency is being very explicit about what constitutes a pocket knife.
The blades can be no longer than 2.36 inches and cannot be more than a half inch at its widest point.
Knives with fixed blades and knives that lock into place will not be allowed on board.
Any knife with a molded grip is also forbidden.
Box cutters and razor blades will still be banned.
The TSA is also allowing some other items on board planes.
Novelty baseball bats that are longer than 24 inches but weigh less than 24 ounces will be allowed.
Sports equipment that previously had to be checked, such as lacrosse and hockey sticks, pool cues and ski poles, will also be allowed on board.
The new rules are set to take effect April 25.
The TSA says they would conform U.S. security standards to international standards and allow airport security to focus on more serious safety threats.
At least one flight attendants union has blasted the policy calling it "dangerous" and "shortsighted".
New Yorkers had a mixed reaction to the news.
"It's a pocket knife, so that would be equivalent to, like, a sharp plastic knife, which would be on a plane, toothpicks," said one New Yorker.
"I don't understand how you can carry a sharpened blade and not have a bottle of water or be able to trim your nails or shave your face before you get into the airplane and look fresh," said another. "It's just ridiculous. What do you need a pocket knife for?"