These item are to be carried by EVERY INDIVIDUAL, whether hiking solo or in a group. Couples are especially encouraged to carry their own 13 essentials, as well as their own food and water, just in case one or the other gets separated from their spouse or group.
PLEASE error on the side of caution.
NEVER rely on others. And know your equipment inside and out, before venturing into nature.
KNOWLEDGE is the most important thing you can take into the mountains.