Where can I get a strong, durable, compact, light umbrella?

Unbelievable. After less than a year, and less than a-dozen uses, the Shelta umbrella I bought last May has already broken. It's not totally unusable, but structural integrity has been severely compromised. I'll certainly be chasing up the 12 months warranty as soon as I can find the receipt, but in the mean time, what are some more robust alternatives? All I really want is something