Gracias,
I have flown a bunch of the low fare carriers in Europe (Easy Jet, Ryan Air) so I'm familiar with the drill. I just needed to know their requirements because my sister is coming from the US and will probably have more stuff than normal. The good thing is that we can split our weight between us (since I can bring next to nothing).
I don't know why I can't get into their FAQ page, but thanks again for your help.