Bear with me as I haven't tried to put links up before!
We use these for sandwiches- SKU=1390472
sandwich
These as lunchboxes (there are ones that are smaller too- 2l, and 2l that's split into two, the lids for all three fit any of the boxes.)
lunchbox
And these for small things like carrot sticks, cheese, raisins etc (the deeper version for popcorn)
small containers
They come in different colours and depths (deeper container but same size lid so you can swap them), they are often on special at warehouse or countdown for 50% off, cheaper in multipacks and not so expensive you have a heart attack if it doesn't come back home. We get the flat foil stickers and the kids decorate the boxes with those, they go through the dishwasher fine.
When I started buying these I got rid of my other types of kitchen storage too because everything stacks inside each other nice and tidy which is really handy when you have limited cupboard space or five children, lol. The kids choose a box and a lid, doesn't matter if they don't match, and we write our surname on them with vivid.
In summer they have fridge-chilled drink bottles which they'll put next to the "cool" foods (the advantage of the bigger 3l boxes).
And voila, I haven't had to buy clingfilm or sandwich bags for at least 5 years,

. (5 years x $160, ouch!) And considering my youngest is only 20mths we'll save a lot more money yet. And the planet according to my 8yo dd eco-warrior, lol.
We've chucked a couple in the recycling but they've been stood on at school or dropped on concrete (thrown through a netball hoop, grr) and I don't think a lot is going to survive that!