Insulated shipping container and method of making

1. A thermally insulating container, comprising:

an outer container that is a box formed of a paper and having an outer floor, a plurality of outer walls, and a plurality of flaps extending from upper edges of the plurality of outer wall and foldable to close the box;

an inner container formed of a paper and having an inner floor and a plurality of inner walls and located within the outer container, a space between the plurality of inner walls and plurality of outer walls defining an outer cavity, and a space interior to the plurality of inner walls defining an inner cavity to hold a product for shipping in the container;

a recyclable or compostable thermal insulation material formed primarily of plant fiber disposed in the outer cavity and around the inner container;

four rectangular collar sections arranged in a rectangular ring with each collar section joined to and extending outwardly from an upper edge of a corresponding inner wall of the plurality of inner walls of the inner container so as to be substantially co-planar with a top of the inner container, each collar section extending to a corresponding outer wall of the plurality of outer walls and covering the thermal insulation material between the inner container and outer container, wherein the plurality of flaps are positioned such that when the box is closed the plurality of flaps extend over the collar sections; and

a plurality of first tabs, each first tab integrally joined to and extending downward from an outer edge of a collar section on an exterior side of the thermal insulation material.

2. The container of claim 1 , comprising a plurality of second tabs, each second tab integrally joined to and extending downward from an outer edge of a collar section on an interior side of the thermal insulation material.

3. The container of claim 2 , wherein each first tab is adhesively attached to the outer container and each second tab is adhesively attached to the inner container.

4. The container of claim 2 , wherein each first tab extends into a matchingly positioned first slot in the outer container and each second tab extends into a matchingly positioned second slot in the inner container.

5. The container of claim 2 , wherein the plurality of first tabs include at least one tab extending downwardly from each of four outer edges of each of the rectangular collar portions.

6. The container of claim 2 , wherein the plurality of second tabs are adhesively attached to the inner container.

7. The container of claim 1 , wherein the collar is a separate piece from the inner container.

8. The container of claim 1 , wherein the collar is cardboard.

9. The container of claim 1 , wherein the plant fiber is formed from cotton fiber, corn stalks, or coconut husk.

10. The container of claim 1 , wherein the outer container and inner container are cardboard.

11. The container of claim 1 , wherein the thermal insulation material formed primarily of plant fiber directly contacts the inner walls and outer walls.

12. The container of claim 1 , comprising a rectangular insert that fits inside the outer container above the collar.

13. The container of claim 12 , wherein the rectangular insert comprises a plant fiber filler surrounded by sheets formed of a biodegradable plant material.

14. The container of claim 1 , wherein the plant fiber is compressed by and between the inner container and the outer container.

15. The container of claim 1 , wherein each collar section extends along an entirety of the upper edge of the corresponding inner wall of the plurality of inner walls.