I posted a reply earlier that did not appear on the forums - I hope this one does.
--
Thank you all for your responses and suggestions. I will certainly look through these options. Any thoughts on the Victorinox Wainwright or their Architecture 3.0 series briefs in general?
It does look like the only real light-weight options are Case Logic and Amazon Basics. Waterfield has some nice designs but their Zip-Brief looks too slim to hold anything beyond a laptop (and it has no place to store the strap).
Finally, at TPACjv: the B-R contact brief does not have a back pocket or flap to store the shoulder strap, but thank you for the suggestion.