I'm sure they do. That is unavoidable but that isn't the point. The point is to reduce the waste stream and recycle. One thing you did not see in that march were throw-away beverage bottles. Instead the marchers carried reusable bottles. A vehicle with with water tanks provided refills.
There is a lot that can be done. Consider all the unnecessary packaging, much of which is for shelf space visibility. Software is a prime example of that, a big box with a small object that could even be downloaded. I saw a solution in Germany where people are charged for trash pickup based on the volume / weight of their trash. This causes people to demand that stores not stick them with the packaging which leads the stores to demand the same from manufacturers.
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