Abstract: A double-walled container includes a top opening, and a bottom opening, opposite the top opening. A removable top cap engages with threads at the top opening and a removable bottom cap engages with threads at the bottom opening. The double-walled container includes an outer wall and an inner wall. A channel formed on and encircling the outer wall includes a vacuum port through which air between the outer and inner walls is drawn out to form an insulating space between the inner and outer walls. A band is positioned within the channel to cover the vacuum port.

Abstract: A bottle has a storage compartment to store an item. The bottle includes a top opening, a bag inside the bottle defining the storage compartment, a bottom opening formed by an opening of the bag, and a bottom cap that includes at least one hole. The bottom cap is removably connected over the bottom opening to provide access to the storage compartment.

Abstract: A container includes a body, a bag, and a bottom cap. The body includes a top opening, and a bottom end, opposite the top opening. The bag is positioned inside the body and includes an opening at the bottom end of the body. The bottom cap includes a hole. The bottom cap is removably connected over the opening of the bag. The hole in the bottom cap allows air in the bag to escape.