Solid Quality, Not Completely Leak Proof

I've used these lunch boxes almost everyday for about 2 weeks now for my kids. They are convenient, large, easy to clean, but not completely leak proof. I think over the past 2 weeks, the middle of the lid has started to arch up. Not enough for food to flow between compartments, but enough for very liquidy contents (oil, water, juice) to get through. I'd recommend not putting very liquidy things in; if it's just everyday food, does good enough job keep everything in. Overall, quality is solid (except for the leak-proof claim) and still very useful for lunch.

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