US schools grapple with shortage of a lunchtime staple: milk cartons

Agricultural department says multiple states will be affected, forcing a brainstorm of backup plans

The tiny, half-pint cartons of milk served with millions of school lunches nationwide may soon be scarce in some cafeterias, with districts across the country scrambling to find alternatives.

The problem is not a shortage of milk itself, but the cardboard cartons used to package and serve it, according to dairy industry suppliers and state officials.