Splenda packets : Amazon.com
For the tea bags, does the net weight labeled on the package represents the weight of the tea leaves inside the bags ? Or the net weight labeled is the weight of the tea bags ? Similar question for the sweetener.
The product is tea (or Splenda), so the weight is for the tea (or Splenda). The packaging is not included in the net weight, and a tea bag is considered packaging. Yes, I used to work for the company behind Lipton, and I dealt with fill weight issues. There is an entire FDA document on fill weight issues and labeling of packages. I think this is the document with labeling and fill weight (and volume) issues.
I did a little more hunting, and this NIST document is the one that goes into the gory details of fill weight (and volume). It has been a while since I dealt with this issue.