What is the size of baggage allowed in airport?

Ugh, baggage allowance at the airport – such a pain, right? I always stress about it. What's the deal with those size limits anyway? It seems like every airline has its own crazy rules. I remember once, I was so sure my backpack was within the limits, it was a pretty standard size, you know? But then this guy at the gate, bless his heart, he was super strict, and said it was just over, and I had to gate-check it. The stress! I almost missed my flight.

Anyway, I think I've read somewhere that a pretty common guideline is around 22 x 18 x 10 inches – or 56 x 45 x 25 centimeters if you're going metric. But honestly, that's just a general idea. It's like, seriously, who remembers those numbers? I don’t! I always check my airline’s website before I leave. It's just not worth the hassle. Because, you know, it all depends – it's not just about size, it's about weight too, and it even depends on what class you're flying in, first class often gets more leeway, which isn’t fair, is it? And, gosh, even the type of plane can matter! So, yeah, don't just assume anything. Always, always double-check. Learn from my near-miss!