Heavy-duty protection for jewelry components, craft supplies, and precision parts that demand puncture-resistant packaging. These 4x5 flat poly bags deliver exceptional strength with 4 mil thick low-density polyethylene (LDPE) construction. Ideal for jewelry makers, bead suppliers, craft retailers, and industrial operations packaging small hardware, electronic components, or precision parts. The reinforced bottom seal prevents tearing under load, while the generous 4x5 size accommodates bracelets, necklace components, bead assortments, and small craft kits. Manufactured from 100% virgin LDPE resin meeting FDA and USDA food-contact compliance standards, these bags offer superior clarity compared to standard 2 mil bags — allowing customers to see product quality without opening. The 4 mil thickness provides critical puncture resistance for items with sharp edges like jump rings, metal findings, wire components, or fasteners, while remaining flexible enough for easy filling and sealing. Key Benefits: 4 mil thickness resists punctures from sharp jewelry findings and metal components Superior clarity showcases product quality for retail display Reinforced bottom seal handles weight without splitting Versatile sealing — heat seal, tie, staple, or tape closed FDA/USDA compliant for food-contact applications 100% virgin LDPE for consistent clarity and strength Specifications: 4" x 5" | 4 mil | Low-Density Polyethylene (LDPE) | 1000/case | FDA/USDA compliant | Bottom seal Common Applications: Jewelry findings and components (jump rings, clasps, ear wires, chain links), bead assortments (seed beads, crystal beads, gemstone chips), craft supplies (buttons, sequins, small embellishments), small hardware (screws, washers, nuts, bolts under 1 inch), electronics parts (resistors, capacitors, transistors, IC chips), collectible coins and stamps, pharmaceutical samples, cosmetic samples, seed packets, fastener kits. What are 4 mil flat poly bags best used for? 4 mil flat poly bags are ideal for packaging items with sharp edges or points that might puncture thinner bags, such as jewelry findings, small hardware, electronic components, and craft supplies. The extra thickness provides durability while maintaining clarity for product visibility. Can these bags be heat sealed? Yes, LDPE flat poly bags can be heat sealed using an impulse sealer or chamber sealer. They can also be closed with twist ties, staples, tape, or self-adhesive labels depending on your packaging workflow and security requirements. Are 4x5 poly bags suitable for food contact? Yes, these bags are manufactured from 100% virgin LDPE resin that meets FDA and USDA food-contact compliance standards, making them suitable for packaging dry food items like spices, tea samples, candy, nuts, or baking ingredients.