坐飞机可以带 折叠折叠小刀/瑞士军刀 吗？（美国TSA/加拿大CATSA标准）

严禁随身：根据民航反恐与安保规定，各类刀具、刀片及锋利工具严禁带入客舱。

允许托运：可以放入托运行李办理托运，但必须将锋利刀刃妥善包裹或装入护套以防伤人。

Standard carry-on baggage size allowances apply; TSA publishes no individual numerical cap for personal use.

If prohibited items like Pocket Knife are discovered at checkpoint screening, screeners will prohibit entry past the security perimeter. You must voluntarily surrender the item for disposal, return landside to pack it in checked luggage, hand it to a non-traveler, or risk law enforcement referral.

Not in the cabin — any knife blade makes it prohibited there, whatever the length. It travels fine in checked luggage, sheathed or wrapped.

Without a knife blade, yes — bladeless multi-tools are allowed in carry-on, and scissors under 4 inches are fine. One blade of any size sends it to the checked bag.