Hi noia,
Vueling are like most of the cheapie carriers in Europe. They make up for their cheap (if you book them early enough) tickets in other ways, such as selling onboard snacks and drinks, excess baggage charges etc.
This is what they say:
"Each passenger may transport up to a maximum of 20 kilograms of baggage with no surcharge. Any excess weight will be charged at 6 Euros per kilo, up to a maximum of 50 kilograms per passenger. The maximum weight admissible per package is 40 kilograms. The maximum weight permitted for carry-on baggage is 10 kilograms, allowing only one piece of baggage with the following maximum dimensions: 45x35x25 centimetres."
Happy flying!
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