Hi, if you fly with RyanAir and you play golf, then bring your clubs and stuff as many clothes and shoes as you can into the bag. There is a set charge of £17 for a golf bag and I think mine weighed about 30kgs in the end.
Definitely check Henry's site and bring some bluetac or whitetac and as muppet99 said bring a bathmat.
Look forward to seeing you in sunny Jerez,
Divet