Container and method of forming a container

The disclosure provides an opening adapter which includes an external bottom threaded surface configured to removably couple to and seal an opening of a canister; an external top threaded surface; a grip ring spaced between the external top threaded surface and the external bottom threaded surface; an internal threaded surface; a plug structure having a substantially cylindrical top portion and a substantially cylindrical bottom portion, the plug structure further including: a threaded outer surface configured to removably couple to the internal threaded surface; a handle, rigidly coupled to the top; a retention tab, flexibly coupled to the bottom portion; and an external channel, extending between a channel top edge and a channel bottom edge. The disclosure further provides an insulating container which includes a canister having a first inner wall having a first end having an opening extending into an internal reservoir; a second outer wall forming an outer shell; a sealed vacuum cavity; and an opening adapter as described above.