Looking for polymailers/pizza boxes

I did post this in the “where can i find” section but no answers so I thought I could try here.

I am looking for large polymailers, approx 40cmx40cm. (These are the plastic bags that couriers use.) I searched alibaba.com and have looked around different places but can’t find them here. Does anyone’s company use these? You can get them in the US through ebay etc but shipping must be very high for such a heavy item.

Alternatively, anyone know where I could pizza-size boxes without all the printing on them?

Thanks in advance.

I hope I dont misunderstand what you mean.
Well,have you tried the post office?

They don’t sell them at the post office. And apparently you can’t get them in Hong Kong either, I have been following a thread on asiaexpat.com.

What I am looking for is this:

Made of plastic, no bubblepak inside.