Acceptable to reuse packing envelopes and boxes?

To my learned eBay-ers..............

As a non professional - recreational seller how acceptable is it to re-use padded envelopes/boxes etc?

I have recieved itmes over the years that have obviously used preloved packaging and I have had no problem with it.

Indeed the majority of people re-using packaging have put in extra effort to ensure itmes are well packaged.

I have recieved some larger items so well wrapped in some old used cardboard (just cut up boxes from other items bought) that they have resembled a work of oragami.

I have done the same with wrapping some unusual shaped items but I am now considering reusing some of the plethora of used padded bags/envelopes piling up in my packing box of bits and pieces.

Personally I do not see a problem and obviously it is important to cover old addresses/lables etc.

Also to make sure no nasty little creatures have nested themselves inside.

How many other non-professional sellers do this? 

I would not be impressed if professional sellers or those charging full price postage and packing charges did this but as I more often than not include "Free Shipping" I see this as a small and acceptable win.

Just looking for others input/opinion (I will still do this but just looking for others opinions in a friendly discussion).

Cheers

Thommo