In reply to PhilMW:
As per ebdon's comment, it's probably worth checking the max dimensions first, but you should be fine if you're taking a standard size pad. If you've got something bigger (Organic Big Pad, Moon Saturn etc...) this could present more of a problem, but even then I'd be surprised it's an issue otherwise I'm sure I'd have heard about it.
What I'm trying to remember (and can't) is whether or not I booked it in as an additional bag/sporting bag or if I used it as my main bag outright. If you have a taco pad then you can stuff your standard travel duffel within it, which makes for the ultimate protective layer. If you do this you'll then need to buy a few ratchets in order to secure it, but these don't cost much and are always useful if you're carrying multiple pads around (be that at home or abroad).
Hopefully that's of some help