How to Use This Packaging Glossary
This reference guide covers the most common terms you'll encounter when ordering plastic bags, poly mailers, food packaging, and flexible film products. Each definition includes:
- Plain-language explanation – No jargon, just what it means for your packaging needs
- Common applications – Where you'll see this feature or specification
- Related products – Links to categories using this term
Bag Specifications & Sizing Terms
What is Mil Thickness?
Mil refers to bag thickness measured in thousandths of an inch (0.001"). Common thicknesses:
- 1-2 mil – Lightweight poly bags for dry goods, apparel
- 3-4 mil – Medium-duty bags for heavier items, food packaging
- 6+ mil – Heavy-duty bags for industrial use, sharp objects
Thicker bags cost more but offer better tear resistance and product protection. See our .
What is a Gusset?
A gusset is an expandable fold on the side or bottom of a bag that allows it to hold bulky or irregularly shaped items. Types include:
- Side gusset – Expands width for boxed products or thick items
- Bottom gusset – Creates a flat base so bags stand upright
Popular for retail packaging, gift bags, and food products. Browse .
What Does 'Lip' or 'Flap' Mean?
The lip (or flap) is the extra material beyond a bag's seal that allows for closure methods like:
- Adhesive strip – Peel-and-seal closure
- Fold-over flap – For stapling or taping
- Drawstring header – Tie or cinch closed
Typical lip sizes: 1.5" to 3". Larger lips accommodate thicker products or labeling.
Material & Film Types
LDPE vs HDPE – What's the Difference?
LDPE (Low-Density Polyethylene) – Soft, flexible, good clarity. Used for produce bags, garment bags, squeeze-able packaging.
HDPE (High-Density Polyethylene) – Stiffer, crinkly texture, better moisture resistance. Common for grocery bags, trash liners, industrial packaging.
Both are recyclable (code #2 or #4). Choose LDPE for flexibility, HDPE for durability. See our and .
What is FDA Food Safe?
FDA-compliant (or food-safe) bags meet U.S. FDA regulations for direct food contact. Made from virgin resin (no recycled materials), free of harmful additives.
Required for packaging dry foods, frozen items, fresh produce, and any product consumed by humans. All our are FDA-approved.
What is Anti-Static or ESD Plastic?
Anti-static bags prevent static electricity buildup that can damage sensitive electronics. Types:
- Pink poly – Dissipative (reduces static)
- Metallized film – Shielding (blocks electrostatic discharge)
Essential for circuit boards, hard drives, medical devices. See .
Closure & Sealing Methods
What is a Zipper or Zip Lock?
A zipper (or zip-lock, press-to-close seal) is a resealable plastic closure that snaps shut. Benefits:
- Reusable – Open and close multiple times
- Tamper-evident – Shows if bag was opened
- No tools needed – Customers can reseal without tape
Popular for retail products, samples, parts storage. Browse .
What is a Peel & Seal Closure?
Peel-and-seal (or self-seal) bags have an adhesive strip protected by a paper liner. Peel off the liner, fold the flap over, and press to seal – no heat, tape, or equipment needed.
Ideal for shipping, e-commerce, subscriptions. See .
What Does 'Open Top' Mean?
An open-top bag has no built-in closure – you seal it yourself with twist ties, tape, heat sealing, or staples. Offers maximum flexibility for custom packaging workflows.
Specialized Features
What is a Vent Hole or Perforation?
Vent holes allow air to escape so bags lay flat during packaging. Useful for:
- Reducing bag puffiness in automated packers
- Preventing moisture buildup (fresh produce)
- Easier stacking and storage
Common in garment bags, bread bags, and high-volume shipping.
What Does 'Tamper Evident' Mean?
Tamper-evident packaging shows visible signs if opened or altered. Methods include:
- Tear strips – Must be torn to open
- Security seals – Break when removed
- "VOID" patterns – Adhesive leaves a mark if peeled
Required for pharmaceuticals, cash deposits, evidence bags. See .
What is a Hang Hole?
A hang hole (or euro slot) is a die-cut hole at the top of a bag for hanging on retail displays or pegboards. Standard size: 1" diameter, centered 1.5" from top edge.
Printing & Customization Terms
What is Flexographic Printing?
Flexo printing uses flexible rubber plates to apply ink directly to film. Advantages:
- High-speed – Thousands of bags per hour
- Cost-effective – Economical for large runs (5,000+ units)
- Durable – Ink bonds to plastic, won't rub off
Best for logos, branding, instructions, and warning labels. Contact us for .
What Does 'Recyclable' Mean for Plastic Bags?
Recyclable means the bag material (LDPE, HDPE, or PP) can be processed into new products. However:
- Most curbside programs don't accept plastic bags (clogs equipment)
- Bring to retail drop-off bins (grocery stores, big-box retailers)
- Look for "How2Recycle" labels for instructions
We offer for eco-conscious brands.
Still Have Questions?
Can't find the term you're looking for? Our packaging specialists can help you:
- Match specifications to products – "I need a 3 mil, 10x13" bag with peel-and-seal – what do I order?"
- Recommend the right material – "Should I use LDPE or HDPE for frozen food?"
- Estimate quantities – "How many bags fit on a pallet?"
Contact us: or
For detailed product specifications, browse our or use the search bar above.
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