4 Mil Flat Poly Bags
- 113 sizes in stock
- Widths 2" – 44"
- Lengths 3" – 64"
- 4 Mil
- 50 – 5,000 per case
- From $20.47/case
- Ships same day before 1 PM PT
4 MIL FLAT POLY BAGS
Which thickness do you need?
| Thickness | Weight | Best for | In stock |
|---|---|---|---|
| 1 Mil Flat Poly BagsEconomy lightweight | Economy lightweight | Light items such as apparel, paper goods and bakery products | 15 sizes |
| 1.25 Mil Flat Poly BagLightweight | Lightweight | Light items that need a little more puncture resistance | 19 sizes |
| 1.5 Mil Flat Poly BagsEconomy weight | Economy weight | Light to medium items like parts, linens and food | 134 sizes |
| 2 Mil Flat Poly BagsStandard weight | Standard weight | Everyday packaging of parts, apparel and food | 120 sizes |
| 3 Mil Flat Poly BagsMedium weight | Medium weight | Heavier parts, hardware and items with corners | 52 sizes |
| 4 Mil Flat Poly BagsHeavyweight | Heavyweight | Heavy or sharp-edged items such as tools and industrial parts | 113 sizes |
| 6 Mil Flat Poly BagsExtra heavyweight | Extra heavyweight | The heaviest, most puncture-prone loads | 21 sizes |
4 Mil Flat Poly Bags: frequently asked questions
What sizes do 4 mil flat poly bags come in?
We stock 113 sizes, in widths from 2" to 44" and lengths from 3" to 64". Every size and its case price is listed above. Need a size we don't stock? Send us a Custom Quote Request.
Is 4 mil the right thickness?
4 Mil is heavyweight, made for heavy or sharp-edged items such as tools and industrial parts. Mil measures film thickness: 1 mil is one-thousandth of an inch (0.001"). Compare all thicknesses in the table above, or read our guide, What is a Mil?
How are they sold, and is there a minimum order?
By the case, with 50 to 5,000 per case depending on size. There's no minimum order, and the more you order, the lower the price per case; each product page shows its volume price breaks.
When will my order ship?
Orders placed before 1 PM Pacific on business days ship the same day from our California warehouse, and delivery usually takes 2–5 business days. Orders of $1,500 or more ship free to commercial addresses. We don't ship to Alaska, Hawaii or Puerto Rico.
Can I get a sample before ordering?
Yes. Samples are free; you only pay a $6.99 shipping fee. Click Want a Sample? on the product page of the size you want.
Do you make custom sizes, colors or printed bags?
Yes. Besides our stock 4 mil flat poly bags, we make custom sizes, thicknesses and colors, and can print your logo or brand on the bags. Send us your specs with a Custom Quote Request.
4 Mil Flat Poly Bags: Heavy-Duty Protection
4 mil (.004") bags are twice as thick as 2 mil and built for products that would puncture or tear a standard bag. Pick 4 mil for heavy items, parts with corners or edges, and anything that will be stored, stacked or shipped where bags get dragged and handled. Buying these industrial plastic bags wholesale by the case keeps the cost per bag down on high-volume lines.
Built for
- Industrial tools, parts and hardware
- Bulky or heavy retail items
- Bulk food packaging, meat, produce and frozen goods
- Warehouse storage and shipping
Strength you can measure
The film is 100% virgin LDPE, formed from seamless tubing with no side seals or slits, and tested to ASTM D1709 puncture and ASTM D882 load-bearing standards. It is food-safe, meeting FDA and USDA requirements for food contact, so the same bag works on a food line and in the warehouse. Seal with a heat sealer, bag tape or twist ties. Sizes 36" wide and under are dispenser-packed in 100s, and every bag is 100% recyclable.
Choosing between 3, 4 and 6 mil
- 3 Mil: a lighter, lower-cost option when items are heavy but not sharp.
- 4 mil: the heavy-duty all-rounder for industrial, commercial and food-service poly bags.
- 6 Mil: for extreme-duty jobs, sharp hardware and long-term storage in tough environments.
Same strength, other formats
For heavy items that need to be opened and resealed, use 4 Mil Ziplock Bags. For long or odd-length products, 4 Mil Poly Tubing lets you cut each bag to size. Need a custom size or thickness? request a custom quote.