I love these for prepping for the week. I get everything cooked for the week on Sunday's, set out my set of six containers and dish up everything for the week for lunch. Helps me manage portions and also they store great. Monday morning, grab the stack and off to work. Because they are glass, don't have to worry about plastic, I will say I don't heat with the lid on in the microwave, I'll use something else to help preserve the shape.