Lunch Bag

How can "brown bag" lunch at a professional office?
To save money, I'd like a packed lunch and snacks to bring with me to my work. Years ago, I just throw the food in a plastic bag. I have a high level position now, and do not want to bring some bad taste. The brown paper "lunch" bags are not big enough. How can everyone else for lunch? Is there a simplified process, insulated bag is simple and professional looking?
I've seen a lot of women get lunch, drinks, snacks, etc in gift bags and taken to work.
Lunch Bag
Lunch Bag











