How to Use These Packaging Guides
Each guide is built on 40+ years of packaging manufacturing experience. We cover the questions our customers actually ask: What thickness do I need? What's the difference between LDPE and HDPE? How do I choose between suppliers? Which bags are food-safe?
Start With Your Application
Different products need different packaging. E-commerce sellers need durable poly mailers that protect products in transit. Food businesses need FDA-compliant, food-safe materials. Retailers need clear bags that showcase products while preventing damage.
If you're packaging for e-commerce: Start with our poly mailers category to understand thickness ratings (2.5 mil vs 3 mil), tear resistance, and why premium mailers reduce customer complaints.
If you're packaging food products: Read our food-safe packaging requirements guide to understand FDA compliance, direct food contact materials, and the difference between LDPE and BOPP for bakery items.
If you're comparing wholesale suppliers: Our 2026 supplier comparison covers Prism Pak, Uline, noissue, and other major wholesalers — minimum orders, pricing structures, and who's best for small businesses vs large operations.
Understanding Materials: The Basics
LDPE (Low-Density Polyethylene): Soft, flexible, durable. Common in poly mailers, merchandise bags, and general-purpose packaging. Food-safe when virgin material is used.
HDPE (High-Density Polyethylene): Stiffer, more crinkly. Used in grocery bags and some food packaging. Lower cost but less durable than LDPE.
BOPP (Biaxially Oriented Polypropylene): Crystal-clear with high clarity. Ideal for bakery bags, candy packaging, and retail display. Excellent moisture barrier.
Cello (Cellophane): Biodegradable, plant-based film. Premium option for gift packaging and eco-conscious brands. Not waterproof unless coated.
Thickness & Mil Ratings Explained
Bag thickness is measured in "mil" (1 mil = 0.001 inch). Common ratings:
- 1.5 mil: Light-duty. Fine for clothing, soft goods, minimal protection needed.
- 2.5 mil: Standard e-commerce. Balances cost and durability for most shipments.
- 3 mil: Heavy-duty. For sharp-edged items, industrial parts, or premium customer experience.
- 4+ mil: Industrial-grade. Reusable, extremely durable, often used for tools or hardware.
Food Safety & FDA Compliance
Not all plastic bags are safe for direct food contact. FDA-compliant packaging must use virgin (non-recycled) resins and meet specific manufacturing standards.
Direct food contact: Requires FDA-compliant resins. Our cello bags and virgin poly bags meet these requirements.
Indirect food contact: Packaging that touches the outside of food containers (like carry-out bags) has fewer restrictions.
When in doubt, ask your supplier for FDA compliance documentation. We provide it for all food-safe products.
Choosing the Right Wholesale Supplier
Price isn't everything. The cheapest supplier often has hidden costs: high shipping fees, long lead times, poor customer service, or minimum orders too large for small businesses.
What to Compare Beyond Price
- Minimum order quantities: Can you afford to buy 5,000 bags, or do you need smaller quantities?
- Shipping costs & speed: Fast shipping from distant warehouses can cost more than slower shipping from nearby locations.
- Customization options: Do you need custom printing, or are stock sizes sufficient?
- Product range: One-stop shopping vs specialized suppliers.
- Customer service: Can you call and talk to a human, or is everything automated?
When to Choose Prism Pak
We're best for businesses that need:
- Stock packaging in standard sizes (we manufacture common sizes, keeping costs low)
- Wholesale pricing without massive minimums (many products have no minimum order)
- Fast shipping from Pennsylvania (East Coast delivery in 1-3 days)
- Food-safe packaging with FDA compliance documentation
When to Choose Someone Else
We're not the best choice if you need:
- Custom printing in small quantities: Try noissue or Packhelp (they specialize in low-minimum custom printing)
- Every packaging supply under one roof: Try Uline (massive catalog, higher prices, but unbeatable selection)
- Ultra-premium, boutique packaging: Try specialty suppliers focused on luxury brands
See our full wholesale supplier comparison for detailed breakdowns.
Common Packaging Questions Answered
What is the difference between poly bags and cello bags?Poly bags are made from polyethylene plastic, while cello bags are made from plant-based cellophane film. Poly bags are durable, moisture-resistant, and the more cost-effective choice for shipping, storage, and industrial use. Cello bags cost more per bag but deliver crystal clarity, a crisp premium feel, and biodegradability, which makes them the standard for bakery, candy, and gift packaging. How do I know what size bag I need?Measure your product's length, width, and depth, then add 1 to 2 inches to each dimension so the item slides in easily and there is room to seal. For example, a 6" x 4" item fits comfortably in an 8" x 6" bag. For bulky or three-dimensional items, add extra clearance or step up to a gusseted bag, which has expandable side folds. Are all poly bags food safe?No. Only bags manufactured from virgin, non-recycled, FDA-approved resins are safe for direct food contact. Bags containing recycled or reprocessed material are not FDA-compliant for food. Always request food-contact compliance documentation from your supplier before packaging edible products; Prism Pak provides it for every food-safe item we sell. What does mil thickness mean on a plastic bag?A mil is one thousandth of an inch (1 mil = 0.001"), and it measures the wall thickness of the bag film. Higher mil means a stronger, more puncture-resistant bag. As a rule of thumb: 1.5 mil is light-duty for clothing and soft goods, 2.5 mil is the e-commerce standard, 3 mil handles sharp or heavy items, and 4 mil and above is industrial-grade for tools, hardware, and long-term storage. What is the best packaging for e-commerce shipping?A 2.5 mil poly mailer is the best all-around choice for most e-commerce shipments. Step up to 3 mil for heavier products, sharp-cornered items, or premium brands that want a sturdier unboxing feel, and use a bubble mailer for fragile goods. Poly mailers also weigh far less than corrugated boxes, which lowers dimensional weight and postage cost on every order. How much does wholesale packaging cost?Wholesale packaging typically runs $0.02 to $0.10 per bag for basic poly bags and $0.05 to $0.25 per bag for premium cello bags, depending on size, thickness, and case quantity. Custom printing adds roughly $0.10 to $1.00 or more per bag based on the number of colors, coverage, and total volume. Larger case and pallet quantities lower the per-bag price on every material. Why We Publish These Guides
We're a packaging manufacturer, not just a distributor. We've spent four decades helping businesses solve packaging problems — from small Etsy sellers to large food processors. These guides capture what we've learned.
Informed customers make better decisions. Sometimes that means choosing us. Sometimes it means choosing a competitor who's better suited to your specific needs. Either way, you'll understand what you're buying and why.
Have a packaging question we haven't answered? Contact us — we'll add it to our guides.
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