Patent ID: 8757440

Claim:
A container, comprising: an enclosure including a bottom portion, a top portion, and a plurality of sides which bound an interior of the enclosure, the enclosure including a sump region proximate the bottom portion of the enclosure, and a fillable bladder positioned within the enclosure, an interior of the fillable bladder being accessible through an opening in the enclosure proximate the top portion of the enclosure, a bottom portion of the fillable bladder being centered by the sump region under the opening in the enclosure proximate the top portion of the enclosure, wherein a first horizontal cross-sectional area of the fillable bladder located in the sump region of the enclosure is smaller than a second horizontal cross-sectional area of the fillable bladder, a perimeter of the first horizontal cross-sectional area of the fillable bladder is spaced apart from all of the plurality of side walls by the sump region, and the second horizontal cross-sectional area being above the first horizontal cross-sectional area and outside of the sump region of the enclosure.