Ketel One Botanical Cucumber & Mint is a flavored vodka that is part of the Ketel One Botanical series. It is known for its refreshing and crisp taste, with the flavors of cucumber and mint complementing the smoothness of the vodka.

The size you mentioned, 4x355 ml, typically refers to a pack of four bottles, each containing 355 ml (or 12 ounces) of Ketel One Botanical Cucumber & Mint. This size is often referred to as a "four-pack" or a "multi-pack" and is commonly available for convenience and variety.