I'm a big fan of LunchBots. Since school started this year, we've had three of the original shape LunchBots boxes--two Pico (LunchBots Pico Stainless Steel Lunch Container) and one Duo (LunchBots Duo Stainless Steel Lunch Box/Food Container)--that rotate daily through my first grader's packed snacks and lunches. We've gotten some dents in the boxes, but nothing that impacts performance.

Six months into the academic year, I'm supplementing the lunch equipment I picked out in August. We use the aforementioned LunchBots boxes and a Laptop Lunch Bento Set 2.0, Blue and Lime for the bulk of the meals, plus insulated food jars (Thermos Nissan 16-Ounce Stainless-Steel Food Jar & New Thermos Nissan Jcg300p6 Stainless Steel Food Jar 10 Oz Double Wall Vacuum Leak-Proof Lid) for soup, rice, etc. All of these work very well, but I never put the Thermos lids in the dishwasher for fear of ruining them by trapping water inside. (It's a risk for the stainless jar, too, but I've not yet ruined a bottle that way--only the lids!) I'm not rabidly anti-plastic for re-useable items, but I do prefer to use stainless steel where it is practical.

What I was missing was a way to send cold cereal for snack. I put my son's milk in one of these dishwasher-safe travel bottles (Humangear GoToob 3 Ounce (3 pack) Travel Bottle) and send cereal in an old plastic Rubbermaid dish with a screw-on lid. In case he doesn't finish every bite, I want a container that will hold in leftover milk without a huge mess, but be thoroughly dishwasher safe, unlike our Thermos jars. I will use the 16 oz LunchBots jar for this purpose now. It easily passed my fill-with-water-and-shake test (no drips), and the wider opening will be much easier for my son to eat from. (I won't fill it to the top with cereal. That would be too much for my first grader.)

I like having jars in a variety of sizes so I can pack exactly the quantity of food I prefer, so having these come in a set works for me. I purchased the Kids Konserve small (5 oz Kids Konserve KK075 Small Leak Proof Stainless Steel Food Containers, Set of 2) containers on the same day I bought these. Both LunchBots jars are simply too large for foods like applesauce or an appropriate dessert portion for a kid. I also wanted to compare the two brands' lids as they've taken a different approach to water-tight seals. I'm very pleased with my Kids Konserve Stainless Steel Mini Food Containers, Set of 3 dishes for holding a hard-boiled egg or a serving of peas, but they are not water-tight, giving me no clue as to which seal design would work best for us.

For those who are interested, the four dishes I've just compared hold the following amounts of measured water, from smallest to largest:
1/4 cup to the ridge where the lid fits on the outside - Kids Konserve Stainless Steel Mini Food Containers, Set of 3
2/3 cup to the top, which squishes some water out! - Kids Konserve KK075 Small Leak Proof Stainless Steel Food Containers, Set of 2
1 cup to where the top narrows for the screw-on lid - LunchBots Rounds 8 ounce
2 cups to where the top narrows for the screw-on lid - LunchBots Rounds 16 ounce

As it turns out, my child can't easily open EITHER container--not the Kids Konserve pop-off plastic and not the LunchBots screw-off cap. Using my handy-dandy rubber band trick (put one rubber band each around the lid and the body of the dish), he did succeed in opening the LunchBots jar, so I guess these containers win as far as opening is concerned. On the other hand, for my own desire of a milk-free lunchbox at the end of the... Read more

The containers do appear to be leak-proof, at least for the short time I tested them. They seem sturdy enough to stand up to abuse.

It's hard to tell from the product image, but the lids are screwed on. I wish the threads were a little deeper or more widely spaced on the bigger jar, as it is tough to feel when they are lined up and it doesn't always want to screw on straight.

I own several lunchbot containers (the uno and the eco). I saw these are leak-proof so I bought 2 sets of these. While the smaller containers work great, I've had issues with the silicone seals in the larger containers. They keep popping off and falling *into* the food! They would fall off everytime I would turn the lid over and try to screw the top on. I've even tried placing them on top of the rim and slowing screwing the lid on but that doesn't work as well.
If you're having this issue, I would suggest you try for either a replacement or a refund. Otherwise if it's working great for you - that's great. But unfortunately it was not in my case. Otherwise, it's still highly recommended.