Seems the blender bottle gets good recommendations? Costco has these smart shake bottle 2packs which is a similar concept.
I also like the reusable straw option of this Oxo one.
I finally dusted off the Vitamix so need a good way to transport to the office
ETA - insulation isn't a big concern but wouldn't like it to be a big drippy mess either.
Any preferences/considerations or other recommendations?