A disposable, non-toxic, biodegradable, flexible cover fitting on beverage containers to protect from unwanted contamination or spillage is described. In one embodiment, the invention provides a cover for a drink container, the cover comprising: a flexible body having a substantially flat, circular shape; a bead disposed about a circumference of the flexible body; and an indicator visible on at least one surface of the body at which a puncture through the body may be made.

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