The big Drink Coolers of XP, bigger than the XP Jerry Cans, what are they for? It appears they cannot be used to level up heroes.
(“Jerry Cans” – huh, learn something new every day.)
The XP drinks with a yellow border and that look like an oil drum are called Colossal XP Drinks, and raise a hero’s XP by 2.4 million XP (or 2,4 million, depending on your local math notation). You may not be able to use them to level up any of your heroes yet, but at level 315 two of them will barely raise a hero by one level, so yes, that’s what they’re used for.
(edited to correct the border color of the XP drink in question)
No, It’s yellow
red border is Ultra XP (300.000 XP)
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You’re correct, thanks; I’ll edit my comment to prevent confusion.