What Size Liquid Can Go on a Planeの特集記事をお届けします。役立つ情報が詰まっています。

So, what’s the deal? The rule is deceptively simple: 3.4 ounces (or 100 milliliters) per container. That’s it. Every single liquid must fit into this tiny, adorable prison.

And then, all those little prisoners must be stuffed into a single, clear, quart-sized zip-top bag. Think of it as a tiny plastic aquarium for your toiletries. If it doesn’t fit, it doesn’t fly.

I once watched a grown man try to force a full-size bottle of contact lens solution into one of those bags. It was like watching a squirrel try to fit an entire nut into its mouth. His face turned red. The bag ripped. The TSA agent just sighed. It was beautiful.

Why 3.4 Ounces? A Tale of Gooey Paranoia

Why is it 3.4 ounces? That’s such a specific number. It’s not 3 ounces, and it’s not 4. It’s the awkward middle child of liquid measurements.

Here’s the truth: it’s a global standard born from the 2006 liquid bomb plot. In a nutshell, some very bad people wanted to blow stuff up with liquid explosives. So, the whole world agreed: “Okay, fine. You can bring your fancy lotion, but only a tiny, non-bomb-making amount.”

It’s the security equivalent of a parent taking away your candy because you hit your brother. You’re not the problem, but you have to pay for someone else’s silliness. So now, we all suffer with miniature shampoo bottles that run out on day two of a two-week vacation. Classic.

Liquids Allowed in Carry-On Luggage