|Refreshing Summer Cooler Series #22|
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|Previous Series||Series #21|
The Refreshing Summer Cooler Series #22 was added to drop in the June 28, 2011 Patch. These particular crates could not be opened with the normal Mann Co. Supply Crate Key. Instead, they required a Refreshing Summer Cooler Key, which were available through the Mann Co. Store as of the July 1, 2011 Patch.
As of July 11, 2011, these crates could no longer be opened, but will still remain inside players' backpacks.