Whether it's chicken pad thai from Green Peppercorn or leftover charcoal chicken from EJs, I often wash and reuse plastic takeaway containers for later. I'll throw out the container if it's oily or broken.
They're especially handy when after a party and you want people to take home leftover cake or nem nuong.
Sounds tightass but I like to think that reusing/recycling is better than going to landfill.
Plastic bowls, I feed my cats their wet food in them then throw them out after 3 or 4 uses since they get gross. And I wash plastic takeaway containers like you, for their bowls.