I use these containers for my weekly meal prepping! Nothing like a fridge full of beautiful all glass/silicon containers full of yummy meals. I strongly believe that plastics have a place, but that place is not on my nourishing foods. I carry these daily in my bike panniers where they take a beating on my way to the office over railroad tracks and potholes. They do not leak. They nest inside one another well. They clean up nicely, though they will stain like any other silicon product.