This is how I bring my food to work. Pretty easy and simple since everything can fit into one small bag. It’s still a pretty darn heavy bag though because of the 3 glass containers but it’s easy carrying it in a backpack.
An orangey circular lunch bag that came as a set with some Tupperware lunchbox. I stop using the lunchbox since it was made out of plastic and started using glass ones instead. The glass ones aren’t perfect either because the top is still plastic. At least it’s less plastic that comes into contact with the food.
More info after the fold.