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4 Mil Low Density Flat Bags — Heavy-Duty LDPE Poly Bags by LK Packaging
4 mil Low Density Flat Bags
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Why Choose 4 Mil Low Density Flat Bags?
Our 4 mil LDPE (Low Density Polyethylene) flat bags deliver heavy-duty protection for demanding applications. Thicker than standard 2 mil bags, these bags offer superior tear resistance, puncture protection, and durability for moving, shipping, and storing heavier items.
Key Benefits of 4 Mil LDPE Bags:
- Heavy-Duty Thickness: 4 mil (0.004") provides robust protection for items up to 25 lbs
- Superior Tear Resistance: LDPE resin offers excellent stretch and puncture resistance
- Crystal Clear Clarity: See contents without opening the bag
- Versatile Closure: Heat seal, tie, staple, or tape shut
- FDA Compliant: Made from virgin LDPE resin (verify for direct food contact)
- LK Packaging Quality: Trusted brand with consistent thickness and strength
- Bulk Case Quantities: Wholesale pricing for volume users
4 Mil Thickness: When to Use It
4 mil bags are the heavy-duty option in the low-density polyethylene family. Here's when to use them:
| Thickness | Best For | Weight Capacity |
|---|
| 1-2 Mil | Lightweight items (clothing, linens, soft goods) | Up to 5 lbs |
| 3 Mil | Medium-duty (retail products, food packaging) | Up to 15 lbs |
| 4 Mil | ✅ Heavy-duty (moving, industrial, sharp objects) | Up to 25 lbs |
| 6 Mil | Extra heavy-duty (construction, machinery parts) | Up to 50 lbs |
Common Applications for 4 Mil LDPE Bags
- Moving & Storage: Pack clothes, linens, books, kitchenware for residential moves
- Shipping: Protect products during transit (e-commerce, wholesale distribution)
- Industrial Parts: Hardware, tools, fasteners, auto parts with sharp edges
- Food Service: Bulk ingredients, catering supplies (verify FDA compliance for direct contact)
- Retail Merchandise: Heavy or bulky items that need extra protection
- Warehouse Storage: Long-term storage of inventory, equipment, seasonal items
- Construction: Protect materials from dust, moisture, and debris on job sites
4 Mil LDPE vs 4 Mil LLDPE (Linear Low Density)
Both are 4 mil thickness, but the material differs:
| Feature | 4 Mil LDPE (This Category) | 4 Mil LLDPE (TUF-R) |
|---|
| Material | Low Density Polyethylene | Linear Low Density Polyethylene |
| Tear Resistance | ✅ Good | ✅ Excellent (20% stronger) |
| Puncture Resistance | ✅ Good | ✅ Superior |
| Clarity | ✅ Crystal clear | ✅ Crystal clear |
| Cost | ✅ Lower | ⚠️ 10-15% higher |
| Best For | ✅ General heavy-duty use | Sharp/irregular items needing max strength |
Frequently Asked Questions About 4 Mil LDPE Flat Bags
What does "4 mil" mean on a poly bag?Mil is a measure of film thickness, where 1 mil equals 0.001 inches, so a 4 mil bag is 0.004" thick. That makes it a heavy-duty bag rated for contents up to about 25 lbs — twice the thickness of a standard 2 mil bag and 33% thicker than a 3 mil bag. Are 4 mil LDPE flat bags food safe?These 4 mil bags are made from virgin low density polyethylene resin, an FDA-compliant material commonly used in food packaging. For direct food contact — raw meat, produce, or bulk ingredients — verify food-contact compliance on the specific item number, and contact our team for certifications. Can you heat seal 4 mil LDPE bags?Yes — LDPE heat seals cleanly on a standard impulse or bar sealer, and 4 mil film seals well with ordinary equipment. If you don't have a sealer, these flat bags can also be closed with twist ties, staples, or tape. How much weight can a 4 mil poly bag hold?A 4 mil LDPE flat bag safely holds up to about 25 lbs when properly sealed. Actual capacity depends on bag size, the shape of the contents, and how the bag is handled; for loads over 25 lbs or items with very sharp edges, step up to 6 mil. What sizes do 4 mil low density flat bags come in?Stocked 4 mil LDPE sizes run from roughly 6" x 9" up to 24" x 36", sold in bulk case quantities. Browse the sizes listed above, or contact us for custom dimensions and volume pricing. Should I use 4 mil or 6 mil bags for moving?4 mil is the right choice for most residential moves — clothing, linens, books, and kitchenware at up to 25 lbs per bag. Choose 6 mil for heavy tools, machinery parts, construction materials, or anything over 25 lbs. Is LK Packaging the same as Elkay Plastics?Yes — LK Packaging is the current name of Elkay Plastics, a poly bag manufacturer in business since 1950. Bags formerly sold under the Elkay name are now branded LK Packaging with the same specifications and item numbers. Why Choose LK Packaging?
These 4 mil bags are manufactured by LK Packaging (formerly Elkay Plastics), a trusted name in poly bag manufacturing since 1950. Benefits include:
- Consistent Quality: Tight thickness tolerances (actual thickness meets or exceeds 4 mil)
- Virgin Resin: No recycled material - ensures strength and clarity
- American Manufacturing: Made in the USA with rigorous quality control
- Industry Certifications: FDA-compliant materials, ISO-certified facilities
Why Buy from Prism Pak?
- Wholesale Pricing: Bulk case quantities at competitive rates - no membership fees
- Trusted Brands: Genuine LK Packaging products, not generic imports
- Fast Shipping: Most orders ship same day or next business day
- Expert Support: Pennsylvania-based team helps you choose the right size and thickness
- In-Stock Inventory: No backorders on standard sizes
Need heavy-duty protection? Browse our 4 mil LDPE bags above or contact our team for personalized recommendations and bulk pricing.
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