In general, you are prohibited from traveling with sharp objects in your carry-on bags. Multi-tools (multipurpose tools) with knives of any length are prohibited. Please pack these items in your checked bags. Multi-tools (multipurpose tools) with scissors less than 4 inches may be placed in carry-on bags.
but don’t forget (☞ﾟヮﾟ)☞
The final decision rests with the TSA officer on whether an item is allowed through the checkpoint.
If you’re talking about tsa: https://www.tsa.gov/travel/security-screening/whatcanibring/items/multi-tools
In general, you are prohibited from traveling with sharp objects in your carry-on bags. Multi-tools (multipurpose tools) with knives of any length are prohibited. Please pack these items in your checked bags. Multi-tools (multipurpose tools) with scissors less than 4 inches may be placed in carry-on bags.
but don’t forget (☞ﾟヮﾟ)☞
The final decision rests with the TSA officer on whether an item is allowed through the checkpoint.