A container and method for filling same. The container includes a penetrable and resealable portion that is resealable, and a container body having a sealed empty chamber in fluid communication with the penetrable and resealable portion for receiving therein a substance. The container also includes a base, a mid-portion, and an upper portion axially spaced from the base on an opposite side of the mid-portion relative to the base. Each of the base and upper portion define a laterally-extending dimension greater than a maximum laterally-extending dimension of the mid-portion. The method of filling the container includes penetrating the penetrable and resealable portion with an injection member and introducing a substance into the chamber, withdrawing the injection member while engaging the base of the body to substantially prevent upward movement of the body, and applying energy to the penetrable and resealable portion to form a gas-tight seal.