18x20 4 Mil Clear Flat Heavy-Duty Poly Bags 250/Case
$97.49
/ case of 250$0.39 per bag
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Check the fit and feel before buying in bulk.
| Quantity (case) | Item-subtotal discount |
|---|---|
| 1–2 | Base item price |
| 3–5 | 3% off qualifying item subtotal |
| 6+ | 5% off qualifying item subtotal |
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Shipping & returns details
Ships from U.S. warehouses. 30-day returns on unopened stock items.
Shipping cost and timing depend on the product, quantity and destination. Parcel or freight service is used as appropriate. Shipping discounts apply only to qualifying orders and rates.
Standard delivery is to street addresses in the contiguous U.S. Eligible returns must be unused and in original packaging; return shipping may apply.
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Inside dimensions
18" × 20"
Board / material
4 Mil
Color
Clear
Freight class
Class 60
From our customers
“The packaging is sturdy, well-made, and looks professional. We’re really pleased with the quality.”
“They helped us choose the right packaging for our products and made ordering easy.”
“Ordering was easy, everything arrived as described, and we’ll definitely order again.”
Questions before you order?Talk to us
Specifications
| Inside dimensions | 18" × 20" (L × W) |
|---|---|
| Board / material | 4 Mil |
| Color | Clear |
| Sold as | Case of 250 |
| Physical units per order increment | 250 (one case) |
| Case weight | 19.3 lb |
| Outer carton (shipping) | 14.5 × 10.5 × 8.75 in |
| LTL freight class | Class 60 |
| GTIN | 841436026192 |
| SKU | PB1257 |
About this item
SKU PB1257 — 18" × 20", 4 Mil, Clear. Sold as a case of 250, shipped from US warehouses.
Protect your heaviest items with our 18x20 4 Mil clear flat poly bags, manufactured from 100% virgin polyethylene for durability and puncture resistance. Seal with twist ties, bag tape, or impulse sealers for complete shipment security.
Flat poly bags: Good fit for bulk storage, product protection, clear inventory handling, fulfillment packing, and 4 mil packaging workflows. These poly bags help fulfillment, warehouse, ecommerce, and parts teams choose right-sized bags for storage, kitting, packing, and shipping workflows.
Compare nearby options
Larger, smaller and stronger options from the same family. Prices shown are current case prices; freight is calculated at checkout.
Common questions
How do I know if my item fits the 18" x 20" (Lay-Flat) size?
The listed size is 18" x 20" (Lay-Flat). Plan for contents slightly smaller than the nominal size — the usable interior runs a bit under the listed measurement once the bag takes shape around what you load into it.
What does 4 mil film mean in practice?
A mil is one-thousandth of an inch, so 4 mil film is 4/1000" thick — 4 mil film, for example, is twice the film thickness of 2 mil. Heavier film of the same material stands up to punctures and rough handling better; lighter film costs less per bag and packs tighter.
Can I swap PB1257 for the next size up or down?
Not as an exact replacement. The closest sizes in this line are 18x18" and 20x20" (same 4 mil film), and the same 18" x 20" (Lay-Flat) size is also stocked in 1 and 1.5 mil. Before switching, match the listed dimensions, 4 mil thickness, and case count — then reorder by exact SKU PB1257.
How do I close these bags, and how do they ship?
These are open-top bags — close them with a heat sealer, bag tape, twist ties, or staples, whichever fits your workflow. This listing is sold as one case of 250 bags — roughly $0.39 per bag at the current case price (confirm the live price before ordering). Orders ship from Packrift's five US warehouse regions (Central IL, NE PA, S TX, SE GA, and W CA); delivery options and timing are shown at checkout.
Order support
Questions on specs or freight?
Send the SKU, quantity, and delivery ZIP and we will confirm specs, availability, and freight before you order.