I have a slightly older model of this Tumi slim messenger bag here. It’s very lightweight and compact, but the ballistic nylon makes it quite durable and it’s large enough to fit an ultrabook, AC adapter, water bottle, tablet, and other miscellaneous items. Quite a few compartments inside to keep things organized. I’d recommend.
I’ve been carrying in my lunch in a plastic grocery bag for years. A few days ago, this older lady at the office tells me, “hey, I remember my nutty university professors carrying their lunches in plastic bags.”
Ever since, I’ve been self concious of this and I now endeavour to acquire a proper bag. Especially if I’m heading to a new shop… don’t want to be a nutty professor.