Problems getting bags of flour through airport security?

My boyfriend is visiting in a couple of weeks, and I want him to bring me almond flour, coconut flour and flaxseed meal, 2 pounds of each (I can't get any of those where I live). My concern is him being stopped at airport security and questioned about this, I really don't want him to have a bad time or losing his flight because of a delay or something. Anyone has had a similar experience? Any tips that might help?