The Press-Lok closure, designed to be more consumer friendly, has an alignment that allows the hooks to engage without precise lineup. It also has an audible “click” sound so pet owners know when the package is closed.
"There are many tangible consumer benefits that the Press-Lok closure system provides to our Hill's Science Diet packaging," says Christopher Rector, director of marketing of Hill's US. "The Press-Lok application provides a fast, effective and stress-free bag closure solution. [It] opens and closes easily and quickly, keeping the kibble in and the paws out."