18x20 4 mil 500/CTN Flat Poly Bag

These heavy-duty 18x20 flat poly bags are built for jobs that demand both size and strength. Made in the USA from 100% virgin Low-Density Polyethylene (LDPE), each bag delivers over three times the impact resistance and twice the tensile strength of traditional LDPE bags. Whether you're packaging food products, apparel, industrial components, or bulk retail goods, these large-format bags deliver the clarity and protection your operation depends on.

Size: 18" x 20" | Thickness: 4 mil | Material: 100% virgin LDPE | Quantity: 500 bags per carton | Compliance: FDA food-contact compliant | Origin: Made in USA

• Extra-thick 4 mil construction delivers over three times the impact resistance and twice the tensile strength of standard LDPE bags — protecting your contents from punctures, tears, and rips during handling, storage, and shipping.
• Large 18" x 20" format fits bulkier items that won't fit in standard-size poly bags, including folded clothing, large produce, linens, automotive parts, and oversized retail merchandise.
• 100% virgin LDPE resin provides consistent thickness, crystal clarity, and reliable performance throughout every single carton — no recycled material variability.
• FDA food-contact compliant — meets FDA and USDA food safety specifications for direct food contact, making these bags safe for dry goods, fresh produce, baked goods, and bulk food applications.
• Crystal-clear transparency lets you identify contents, read labels, and scan barcodes without opening the bag, improving speed and accuracy at every stage.
• Heat-seal compatible for tamper-evident, freshness-locking closure using any standard flat or impulse heat sealer. Also works with tape, staples, or twist ties.
• In stock, ships within 24 hours from our US warehouse — no long lead times, no backorders, no waiting.

Where it works best:

• Food service & grocery: fresh produce, bulk dry goods, baked goods, portioned proteins, catering prep supplies, and large deli items requiring food-safe containment.
• Retail & apparel: folded garments, sweaters, jeans, bedding sets, pillows, large accessories, and merchandise packaging for display or fulfillment centers.
• Industrial & manufacturing: oversized hardware, large fasteners, machined parts, gaskets, automotive components, and raw material samples that need clean, puncture-resistant protection.
• E-commerce & fulfillment: protective poly-bag liners, garment packaging, multi-item bundle wrapping, and in-box moisture and dust barriers for shipped orders.
• Agriculture & nursery: fresh produce bags, seed storage, plant root wrapping, field harvest containment, and bulk soil amendment packaging.
• Medical & janitorial: large linen management, equipment covers, supply storage organization, and containment bags for clinical or hospitality environments.

Solves key pain points: When standard-size bags are too small and standard-strength bags aren't tough enough, these 18x20 4 mil bags deliver on both fronts. The generous format handles large, awkward, or bulky items without stretching or straining. The four-mil LDPE construction absorbs the kind of handling stress that tears thinner bags — sharp edges, heavy contents, stacked cartons, rough transit. With an open-top design that accepts heat, tape, or tie closures, these bags work however your operation needs them to work.

Order a 500-count carton of 18x20 4 mil flat poly bags today. Prism Pak keeps these in stock at our US warehouse and ships within 24 hours. Dependable, large-format, and built for performance — the right bag for the job, ready when you need it.