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An Emergency Ziploc
Tuck into your child's backpack a small sandwich bag filled with a few Band-Aids, $2 for bake sales or socially crucial snacks such as "the soda machine after gym" and a photo of her during some insanely happy day of her life (also known as: "the soccer goal" or "grandma came to town...with a giant bag of M&M's"). Finish it off with either a hand-drawn or official map of the school.