A briefcase, as CG suggested, would be ideal, particularly with a strap long enough to wear across your body so the weight is distributed. I had some problems with my wrists last year and couldn't lift or carry things - I found such a briefcase very useful. There's also a website (
www.getorganized.com) which features items called "Tuff-bags", which seem to come in different sizes and don't look too expensive.
If your company supplies your laptop, there are laptops nowadays that weigh not much more than a kilo, unlike mine which seems to weigh a ton.
Best wishes,
Raindance