My kids have insulated lunch bags from Stuck on You (which I really wouldn't recommend, but Miss I had a cheap Big W one for kindy and its the same size and about a tenth of the price) and then I've got a drawer full of smash, sistema and tupperware containers that I use with it. I tend to stick with the sistema where I can because they're really cheap and easy for the kids to use

A typical lunch box for us would be a sistema sandwich container, two of the small rectangular sistema containers, a deeper rectangular sistema container with cut up fruit in it, and then also something like a banana thrown in too. There is then usually room for a little bag of popcorn or similar too. Then to top it all off is a cold brick.

I haven't had any leakage issues with the sistema, but given that both my girls don't see anything wrong with putting their drink bottles into their bags upside down with the valves open, a little bit more liquid isn't going to be noticed!