I pack my kids' sandwiches in something similar to this: Easy Lunch Boxes
I also have Laptop Lunch
boxes that we enjoy using. We have the older version, but the newer looks more useful.
More expensive upfront, but I bought the lunch boxes four years ago and could see using them for several more years to come. I have been looking again now that DD is about to start kindergarten - I've got to buy some for her.
I'm not too green in the rest of my life, but have found it easy to pack my kids' lunches with almost no disposable products at all. They also get cloth napkins and real silverware (well, stainless, not real silver
Lots of good lunch menu ideas that the Laptop site also.