if you really need to help someone, what you can do is to have a "group check-in". this way their luggage will still be identified as theirs. and make sure the luggage claim tags are on their tickets, not on yours. mas mataas pa nga baggage allowance pag group check-in eh.
pero ako din i just have my hand carry bag with me, no check-in luggage whatsoever. di nga umabot ng 7 kilos bag ko eh. dati payag ako group check-in, sayang din naman kasi ibabayad nila. pero higit 5 years na hindi na ko namamansin sa check-in counter. unless of course maganda yung chick, para syempre group check-in e di tabi kami sa plane ehehehehe!