Super adorable bag. Started using this late into my sons SK year (used for a few months). Rubbermaid lunch blox fit great! Fully opened and removed containers and ice after each day, to air dry, and was hand dried. At the end of the school year, washed it on delicate.. and after it air dried, black mold spots were EVERYWHERE. Not sure what happened, but will buy an insulated lunch bag for this year, since this one was just lined/not insulated and the outside was damp when it came home after school.