Got my large luggage today. Do you know its capacity?

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I bought a large size luggage today. It's my first luggage this size. I needed it because I am planning a one month trip. I have a question in mind. It is approximately 100 litres. If I fill it with clothes and a few pairs of footwear, cabin you guess how much would it weigh? I have a 23 kgs limit for the flight. Will I have to leave the luggage half empty? Maybe I bought a too big size what do you think?