score:1
isolate protein powder, hemp fibers and some pills (CLA to be more exact) - all bags opened, but resealable.
These are all okay with security. The rule of thumb: if it's liquid, flammable, sharp -- you might have a problem, otherwise typically not. Next, we need to look at these things crossing borders -- and for that, it's irrelevant whether in a carry on or checked in.
Bucharest to Milan
You are within the EU carrying personal amounts. Knock yourself out. You fall under one the four fundamental EU movement freedoms: goods, capital, services, and labour. Goods, in this question.
Milan to Honolulu
Let's see.
Non-prescription medicines (also known as over-the-counter or OTC medicines), vitamins, herbs, and supplement products fall under the jurisdiction of the Food and Drug Administration (FDA). In general FDA will not object to the personal importation of those products, as long as:
The traveler is carrying the products in their possession (or in their luggage);
The amount being carried is an amount reasonably considered for personal use.
That covers protein power and CLA pills.
Hemp has it's own page.
Can I import hemp products into the United States?
Hemp products such as paper, rope, and clothing (which contain fiber made from the cannabis plant) and animal feed mixtures, soaps, and shampoos (which contain sterilized cannabis seeds or oils extracted from the seeds), etc. may be imported into the United States.
Upvote:-2
I am pretty sure those are fine since they're supplements and not liquids/hard drugs. In some airports in europe, you may have to put medications in a separate clear plastic bag to go through security but I think that usually only applies to prescription meds.