Plastic Container Set (BPA free, will do for anything, even liquid) 2. Glass Container Set (BPA-free and leakproof. A little heavier, but great, if you don’t want to microwave your food in plastic containers. I have a set, and I’m super satisfied – works excellently with soups) 3. Stainless Steel Lunch Box (lighter, definitely BPA-free, but also not truly watertight. I also own one though and I love it) One last most obvious tip: always chuck your lunchbox in a plastic bag to be sure nothing leaks. Better to be safe than sorry