I use a Mizuno TB-910M soft bag, and I LOVE it. I've never had any club breakage, due to:
* Use a broomstick or PVC pipe at least 1-2" longer than your driver, for protection against shocks. The broomstick or PVC will take the shock before your shafts will.
* Stick the heads of your woods in the BOTTOM of the golfbag for protection. (grips sticking upward)
* Use ironcovers, if you have forged irons, to reduce the banging and bashing.
* Wrap a large towel (or bubblewrap) in/around your clubheads, to secure them in place.
* Carry a glove, some tees, and balls on your carryon luggage. In case your clubs get lost/stolen, you can still play golf (with rentals) without having to invest in more gloves or balls.
Here are my thoughts on features of travel bags:
* Hard vs. Soft bags - I used to have a hardbag (which does protect your clubs better), but I was VERY frustrated lugging it around, breaking handles/locks, and attempting to squeeze it into small rental cars. I much prefer softcases, which can be folded up if necessary, and are a lot easier to manipulate.
* Insurance - check with your insurance company. Sometimes your homeowner's insurance will insure your clubs, if the airlines won't.
* Storage - I like softcases with at least 2-3 internal pockets for your accessories, and extras (raingear, shoes, etc.).
* Wheels - are a MUST.
IF you're on a budget - there are some soft cases from Datrek, BagBoy, and some other brands for under $50 that will work just FINE. Just make sure to get one with wheels.