When someone in the United States of America who once served in the armed forces dies, a military honor guard presents a folded American flag to the family at the graveside committal service. Many people buy or make a wooden three-cornered flag case with a glass front. Although a cheap flag case can be had for as little as $20 US, a decent case made of solid wood can cost over $100 US.
At this link
you can read about the significance of the folds in the flag and other things related to the ceremony.