When it comes to explosives the "I've been doing this for 100 years and still have all my body parts" story generates a warm fuzzy but it's not compelling. "Plastic" materials come in the widest variety of characteristics of anything on the planet. Some plastics are just fine with explosives (no tendency to participate in static electricity generation) and some are not.
The plastics used by Hornady, Jim Shockey, Goex and others is perfectly safe in that regard. Polystyrene (generally open and closed cell foam compounds) is not. When selecting a plastic container look for a dense, smooth structure and you should be safe. The "friction" between the powder and the container is not the issue; it's the other materials that the plastic may come into contact with, such as the living room carpet. No, one wouldn't plan that, but accidents happen, and it's the accidents that kill people. Imagine coming home to find the living room gone because the cat decided to amuse itself by batting around a jar full of bp that one of the kids had left out (despite being told to never touch the stuff). Unlikely? Yes. Impossible? No. Your job is to make it impossible.
Another issue here is the presence of contaminants in the powder. Some materials readily heat up when exposed to static electricity (aluminum or copper shavings, for example). It is possible for those particles to become hot enough to ignite the powder. The message: if your powder may have become contaminated by any such material (for instance, spilled on the workshop floor or bench, then swept up), use it to fertilize the garden.
I agree with looking for screw top lids - that's the best option, but in the short term the metal paint cans with press fit lids sold by most hardware stores come in pint and quart sizes and should suffice. No anode/cathode structure for spark generation and they do seal nicely. As I said, for the short term - a few days in a humid environment, to a year or longer in a dry one. Shotgun Willy's idea is a good one, too.
Keep your powder dry and clean and locked up. That makes it impossible.