Gum tape, or water-activated tape (WAT), is an eco-friendly packaging tape made from kraft paper with a starch-based adhesive that bonds strongly to cardboard when moistened, creating a tamper-evident seal, with reinforced versions containing fiberglass for extra strength on heavy packages. It’s a durable alternative to plastic tape, available in non-reinforced (recyclable) and reinforced types, requiring a special dispenser for activation, ideal for secure and professional box sealing.