SOS food bags — the "Self-Opening Square" design is one of the most practical innovations in food packaging. The flat-bottom gusset allows the bag to stand upright and open with one motion, a critical feature in high-volume takeaway settings. For branded SOS bags, paper weight selection is everything. Lightweight kraft (70-100 GSM) works for short-use bakery and deli bags. For grocery and heavier takeaway, 120-150 GSM kraft provides the structural integrity to prevent bottom blowout. Flexographic printing on natural kraft delivers crisp one-to-two-color branding efficiently. Full-color artwork calls for offset printing on bleached white kraft for accurate color reproduction. Side gusset depth must match the bag width proportionally — a mismatch compromises stability. Vent hole placement matters too: proper perforation prevents steam damage during heat sealing.
