A fluid container is provided that comprises a body portion configured to at least partially surround fluid. The container also includes a cap portion connected to and above the body portion at a frangible separation site surrounding an opening between the body portion and the cap portion. The cap portion is configured to separate from the body portion at the separation site to expose the opening when a substantially downwardly directed force is applied to a part of the cap portion at a certain radial distance from a longitudinal axis through the opening. The container can include a collar configured to be disposed at least around a part of the body portion. A portion of the collar can be configured to facilitate separation of the cap portion.