About $5849, assuming perfect packing density. It's extremely simplistic, but perhaps useful as an upper bound. Convert 5 gallons to 0.01893 m³.
6 Can: Katakuri Katakuri is a user of all the Haki types and his skill with both Armament and Observation Haki is quite advanced, especially when it comes to the latter. With his level of skill, it goes without saying that he's powerful enough to put up a fight against an Admiral.
How did Kenny survive the herd? You can clearly see that zombie took a bite out of his arm. Kenny used his magical mustache powers to force his way through the herd. He then proceeded to use his stache to fly himout of Savannah.