A unique one piece container cover (20) made from a single blank of flexible insulating material (36) and constructed so the tubular container cover (20) is closed at the bottom and open at the top with a flap (28) that when pulled over the enclosed container (39), integrally forms a complete seal (38) with the cover body (22) thus encapsulating the container (39) providing insulation to keep the container (39) contents either hot or cold while also protecting container (39) from outside contamination. The container cover (20) works with various sizes and shapes of bottles, containers or cans. The multipurpose cover (20) can be used without attachments for use in a bike cage, diaper bag, travel bag or the like. The cover (20) can also be fitted with various attachments for hiking, running, backpacking, golf, carrying baby bottles or the like. The cover (20) is efficient, cost effective, lightweight, durable, easy to use and clean, and can be produced in many colors with graphics.