All I can say is I bought these: https://www.amazon.com/gp/product/B01BYA4H1W/ref=oh_aui_detailpage_o08_s01?ie=UTF8&psc=1

(32 Oz. 2 Compartment Meal Prep Containers Durable BPA Free Plastic Reusable Food Storage Container Microwave & Dishwasher Safe w/ Airtight Lid For Portion Control & Bento Box Lunch Box)

I have been using them successfully and they are pretty good, but they are not leak-proof. Even brand new they weren't so "airtight" that dressing didn't leak out of them if they were accidentally turned on their side. I portion my dressing into once cups but a few times something like Thai sauce has leaked through onto my paper lunch bag. So I would be weary of that.

Also the compartment isn't quite big enough. I like it for chicken/rice since I don't eat a lot of that, but for something like a sandwich with normal bread or pizza (I meal prep for BF who eats a lot more than me) it's juuuuuuuust too small. I kind of wish we would have gotten one without a divider. But I know some people wouldn't have a problem, and the divider does come in handy when I want to separate a small side from a small meal. Just my 2 cents.

If we had more space I would get a set of ten non-compartmentalized containers for occasionally having bigger servings.

Overall I would give them a 4/5 stars.