Amazon Heavy Package Labels

Hi guys,

I am still a fairly new seller and have sent some boxes to amazon with no problems. However, I am looking to send some new items but the box weighs over 15kg (just about at 16kg).

I got a little notification to say that there should be heavy package labels on them and just wanted to know whether these need to be self adhesive and if there is actually a standard kind of label they are expecting. Does anyone know if just marking it as a ‘heavy package’ with a marker would suffice or maybe even the words ‘heavy package’ printed out and taped to the box on the top and sides etc.

Any help is much appreciated, as always.

Thanks