Liquid sequestration bag with pinch closure

A bag for collecting and sequestering a liquid comprising:

• a flexible plastic material including two layers of plastic material overlying one another and connected together to form the bag having a top, a bottom and first and second sides;
• wherein the bag is divided into an upper entry chamber and a lower reservoir by two bond lines connecting the layers of plastic material;
• wherein each of the two bond lines extend from one of the sides of the bag and terminate in the interior of the bag
• wherein a closeable opening fluidly connects the upper entry chamber and the lower reservoir and is located between termini of the two bond lines;
• wherein the bond lines include an upper bond line and a lower bond line;
• wherein the upper bond line extends downwardly at an angle greater than 135 degrees from a first side of the bag and extends across the bag further than one-half the of the width of the bag at the widest part of the bag;
• wherein the lower bond line extends from a second side of the bag and terminates below the terminus of the upper bond line;
• a hydrophilic absorbent material is located in the lower reservoir, and
• wherein the bond lines and the opening are configured so that when the absorbent material expands upon absorbing the liquid to expand the lower chamber and cause the bag to be pinched, the opening closes to prevent material from escaping the lower reservoir through the closeable opening.