I once noticed a significant increase in efficiency resulted from simply changing from one type of briefcase to another.
Until the switch, I hadn't realized how the old briefcase had turned into a paper trap. The new one facilitated the organization of projects and saved time. I'd sensed a problem, but had not identified the culprit.
There are people who serve as a pebble in the shoe for teams and who need to be reformed or removed. But what I'm focusing on now are devices; consumer goods that you've found to be an extraordinary aid in increasing productivity and efficiency.
Are there any that come to mind?
[BTW: The briefcase is the Swiss Army combination computer case/briefcase on rollers.]