Usually i bring a 32” suitcase for traveling for a month. But this time I think i need to bring smaller suitcase. But not sure about the size yet.

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Ask the airline what size is considered a carry-on. I the rules might vary based on which company you are using.
It’s not carry on or cabin, but checked baggage. The problem is not about the airline allows, but the luggage who suitable for 30kg?
Contact the airline that way you will get the right answer. There is a size limit & I hear it has changed recently. If not just pay the extra couple of dollars for the checked bag.
It’s not just couples dollars, it’s NT$2200 (US$66.23)
I think that this aluminium suit is too heavy and so you can't pack much in the suit.
Check with the airline what dimensions they allow.
They allowed as long as not more than 1,5m. But that’s not the problem, the point is to ask which luggage who suitable to carry max 30kg, to make it more efficient. Because the biggest luggage, the weight they have.
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3Opinion
Pack your clothes on your bed as if you placed them in a suitcase. This should give you an idea of the size you can get away with.
You can buy fabric one instead of plastic one, more light and more cheap...
I don’t want to carry something with like 30kg weight.
any size... just weigh it before you leave
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