C'mon people. Let's keep this simple and practical. I'm sure that we can all agree that we really need is a 70-200 lens mug that is also an actual lens. Why should we have to carry around both? Just pop out the glass, pour in beverage and we're good to go.
And while we're at it, why are we fixated with 70-200? When I want a caffeine fix, I REALLY want a caffeine fix. That means the all new Canon 800mm f5.6L coffee jug/lens. I mean really, if I'm shelling out over 10k for a super telephoto, shouldn't I at least be able to store about 8 liters of coffee in there?
Diagram not drawn to scale: