You can choose to steal camping gear, pay for it, or leave it behind. Stealing here starts a trend that influences Daniel’s "Morality" score, which ultimately determines your ending.

The brothers force their way through and live together in Mexico. Cross Border

Daniel forces a crossing anyway; Sean is killed, and Daniel ends up alone.

Sean escapes to Mexico alone; Daniel stays in the U.S. under supervision.

Life is Strange 2 - Ultimate Achievement Guide - Steam Community