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A one piece beverage insulator in the form of a beverage container holder with an open top that is die cut from a sheet of insulative foam either open cell or closed cell laminated with a surface vinyl film. The one piece beverage insulator die cut pattern is in the form of two mirror image side hal

A one piece beverage insulator in the form of a beverage container holder with an open top that is die cut from a sheet of insulative foam either open cell or closed cell laminated with a surface vinyl film. The one piece beverage insulator die cut pattern is in the form of two mirror image side halves joined by a center bottom shaped to conform to the bottom of a beverage container to be held by the finished holder. The die cut holder pattern is folded over on itself with the side halves aligned but with the inside foam sides of the halves facing out and the side edges are stitched or vinyl welded together after which the holder is pulled inside out through its open top returning the vinyl surface to the outside. This finished holder is stored in a collapsed flat state to be opened when receiving a beverage can or other beverage container to be held and insulated by the holder.

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1. A fold-up insulative beverage container holder with an open top comprising: a die cut sheet form of insulative material with, two opposite side substantially rectangular halves, a center bottom interconnecting said opposite side substantially rectangular halves and with the center bottom shaped t

1. A fold-up insulative beverage container holder with an open top comprising: a die cut sheet form of insulative material with, two opposite side substantially rectangular halves, a center bottom interconnecting said opposite side substantially rectangular halves and with the center bottom shaped to conform to the bottom of a cylindrical beverage container the holder is designed to hold; and with edges of said opposite side substantially rectangular halves fastened together by fastening means forming two generally vertically extended seams joining said halves together forming the utilitarian insulative holder with an open top for receiving cylindrical beverage containers; wherein said die cut sheet of insulative material is a one sided smooth plastic surface laminated sheet of insulative foam with a smooth vinyl surface and with the one sided smooth plastic surface of said die cut sheet form of insulative material to the outside of said insulative beverage container holder; and wherein said sheet form of insulative material and said vinyl laminated surface in the finished holder present a soft pliable holder collapse foldable to a flat storage state from which it is readily reopenable time-after-time for repeated cycles of storage, like in a pocket, and use reopened as an insulative beverage container holder. 2. The fold-up insulative beverage container holder of claim 1, wherein said foam faces the inside of said holder and said smooth outer plastic surface is a media for printing. 3. The fold-up insulative beverage container holder of claim 1, wherein said seams have edges extending to the interior of said finished insulative beverage container holder. 4. The fold-up insulative beverage container holder of claim 3, wherein said seams are stitched seams. 5. The fold-up insulative beverage container holder of claim 3, wherein said seams are heat seal welded seams. 6. The fold-up insulative beverage container holder of claim 1, wherein said center bottom interconnecting said opposite side substantially rectangular halves has two arcuate opposite side edges connected with fillets to the bottom edges of said substantially rectangular halves. 7. The fold-up insulative beverage container holder of claim 6, wherein said center bottom is so sized that line projections of the bottom ends of opposite sides are close to tangency with a circle projection of said arcuate opposite side edges of the center bottom of the insulative holder. 8. A fold-up insulative beverage container holder comprising: a sheet form of vinyl surface laminated insulative foam material with, two opposite side substantially rectangular halves, a center bottom interconnecting said opposite side substantially rectangular halves and with the center bottom shaped to conform to the bottom of a beverage container the holder is designed to hold; and with edges of said opposite side substantially rectangular halves fastened together by fastening means forming two seams joining said halves together forming the utilitarian insulative holder with an open top for receiving cylindrical beverage containers; and wherein said sheet form of insulative material and said vinyl laminated surface in the finished holder present a soft pliable holder collapse foldable to a flat storage state from which it is readily reopenable time-after-time for repeated cycles of storage, like in a pocket, and use reopened as an insulative beverage container holder; said center bottom interconnecting said opposite side substantially rectangular halves has two actuate opposite side edges connected with fillets to the bottom edges of said substantially rectangular halves; said center bottom is so sized that line projections of the bottom ends of opposite sides are close to tangency with a circle projection of said arcuate opposite side edges of the center bottom of the insulative holder; and wherein opposite side openings between said acruate opposite side edges of said center bottom and the bottom edges of said substantially rectangular halves along with the open top facilitate collapse folding and reopening of said holder through repeated cycles of folding for storage and opening for beverage container carrying use. 9. The fold-up insulative beverage container holder of claim 8, wherein said opposite side openings are aligned with said seam to facilitate said seams to be fold lines in the fold collapse and opening of the insulative beverage container holder.