When does preparation cross into over-Preparation?

My hiking partner brings a 40-pound pack for day hikes. Emergency bivvy, water purification tablets, enough food for three days “just in case.” I bring water, snacks, and a first aid kit. We both make it home safely, but I wonder if I’m being reckless or if he’s missing the point of spontaneous adventure. Where’s your line between prepared and paranoid? #Hiking