Help needed: robust rain protection

Am I allowed a thread completely unrelated to gardening here?

Can anyone recommend a make of really robust folding umbrella? One that collapses down so you can put it in a rucksack or large handbag. I must have got through about 5 in as many months - first gust of wind and they turn inside out, spokes get bent, fabric rips and they are only fit for the bin.

I know the full size ones are stronger, but I also know I will leave them on the train - a folding one has a reasonable chance of not ending up in the black hole that is Lost Property at Victoria Station. 

I'm prepared to pay a bit more than the usual £5-odd for one if it lasts longer than 5 minutes!

Thanks