Which bike transport bag?

[Lien Sdrawde]

I'm visiting a posh pals flat - and taking my bike, which will have to come in the flat with me.

My posh pals posh Mrs will kill me if a drop of dirt should spoil their (posh) carpet - quite understandable....

So, is there a good leak-proof bag anyone can recommend that I can put it in?

 

[Southport101]

CTC sell, for about £5, a big plastic bag. I used it on a flight. Some claim to create a bag from sheets of plastic, from DIY shops, and selotape.