I also don't have a need or patience for fancy lunch boxes. I just put food into containers or baggies, put into a larger plastic bag (the kind you get from grocery shopping in the produce section) for extra leak guarding, and put it into my bag. The produce bags are the only ones that are reliably leak-proof. Honestly, seconds count in the morning and it's important to keep things simple!
The one critical gear requirement is leak-proof and microwave-proof containers. I found a screw-on Ziploc round container at my local grocery, and I also have a couple of those IKEA locking glass containers (they're heavy though). In both cases, the lids are not microwave proof, so I take those off and lay a paper towel over the container.
I also splurged a bit on behalf of the Elixir of Life, otherwise known as coffee. I got a $6 collapsing silicone drip cone on Amazon and take in #2 coffee filters, a mason jar of fine ground coffee, and half and half. A friend and I share a small fridge & electric kettle. Take that, Keurig! I also take the drip cone & supplies on business trips, along with dehydrated powdered cream. If you don't have a fridge, the powdered cream plus a small battery powered frother works nicely.