How do Boone and Little Bear get squished?

Boone and Little Bear get squished when Patrick puts both of them in the pocket of his jeans.

He wasn’t wearing a jacket; the men were in his jeans pocket. Fortunately the jeans were new and loose, but still he had to half stand up to get the bit of bread in; when he was sitting down the people in his pocket must be pretty well squashed against his leg. Omri imagined them trying to eat, held down ɻat by two thick layers of cloth.