When sourcing air sickness bags, the primary focus must be on leak-proof integrity and odor containment. Look for bags made from heavy-duty polyethylene-coated paper or 100% leak-proof plastic materials. The closure system is critical; prioritize designs with integrated metal ties, peel-and-seal adhesive strips, or notched plastic rings that ensure a secure, airtight seal after use. Additionally, ensure the base gusset is reinforced to allow the bag to stand upright, preventing accidental spills.