Canteens are an upcoming action slot item to be used in the Mann vs. Machine gamemode. They are 3 use items with different effects depending on which canteen you own. After completing the first wave, you get a canteen free of charge from Mann Co.
Types
There are currently 5 known canteen types, each with 3 uses.
Ubercharge
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Supplies 5 seconds of personal invincibility.
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Critical Hit Boost
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Full critical power for 5 seconds.
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Ammo/Clip Refill
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Instant ammo and clip refill.
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Return to Base
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Immediately returns user to respawn room and supplies temporary speed boost.
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Buildings Upgrade
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Upgrades user Engineer's buildings to level 3 in a hurry.
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Trivia
- There appears to be a ripped photograph, hinting there is a sixth Canteen.