Blast containment system for trash cans

A blast containment system for trash cans includes a liquid-impervious flexible bag having a sealed bottom positioned at a base of a trash can, and an unsealed top positioned and retained at a top periphery of the trash can. A ring-shaped boot is positioned at the sealed bottom of the flexible bag. A rigid container has a closed bottom press-fit into a central opening of the boot. The rigid container extends from its closed bottom to an open top adapted to be approximately aligned with the top periphery of the trash can. An annular volume is defined between the rigid container the flexible bag. The rigid container has side walls that include ballistic materials. A liquid fills the annular volume.