Can anyone suggest a really useful cabin trolley bag?

Can anyone suggest a really useful cabin trolley bag? I have been using a Mandarina Duck Work bag (just under 50cm) and it's looking a bit long in the tooth, and am looking for a new one? Any suggestions? Main concerns are space for ipad, laptop, magazines, documents, and general knick-knacks

out of all the bags I've gone through I found Samsonite to be the best brand for durability. Sorry i cant remember the name of the type of samsonite I use off the top of my head.

Good Luck

180mis: I've got a TravelPro cabin bag that's been through a fair bit over the years and still holding up pretty well.

http://www.ausbt.com.au/what-to-look-for-when-buying-a-new-carry-on-bag is also worth a read.

thanks for your comments. David, I had a look online at the Travel Pro brand, is there a specific model you have or can recommend re sizing?

thanks

A bit late, but putting it out there. I just blew some points and got the new Qantas Dubai carry on bag with four wheels. Highly recommend it.

Anything by Eddie Bauer, if you can find it in Oz