Heavy Duty Poly Bags – Clear LDPE/MDPE Protective Sacks | Pack Exact

Heavy Duty Poly Bags

Tough, puncture-resistant heavy duty poly bags in clear LDPE/MDPE for parts, metalware, dense components and bulky items. Use as rugged inners or standalone protective sacks inside cartons and crates.

High Micron (≈ 60–200 µ) Open-Ended / Grip / Gusseted Tear & Puncture Resistant Printable

Build a resilient pack with Double Wall Boxes, Pallet Boxes, Cardboard Sheets, Bubble Wrap, Paper Void Fill and Thermal Labels. For lighter items see Light Duty Polythene Bags.

What are heavy duty poly bags?

Manufactured from thicker-gauge LDPE or MDPE film, these bags resist tearing and puncture from edges and hardware. Options include open-ended for heat sealing, grip-seal for re-close, and gusseted bags for larger, boxier contents.

Why choose heavy duty?

Durability: protects dense, irregular items that would pierce standard film.

Moisture & dust barrier: keep components clean inside outers or long-term storage.

Versatility: line cartons, bag hardware kits, or use as return-proof inners.

Best-use scenarios

Engineering & automotive: bolts, bearings, machined parts—bagged kits then boxed in double wall cartons.

Home & garden: tools, fittings, dense metalware—pair with layer pads to protect box panels.

Textiles & upholstery: larger covers and cushions using gusseted bags before crating.

Warehouse & export: liner bags inside pallet boxes to contain dust and loose fill.

Returns & spares: re-closeable grip-seal bags keep components together during checks.

E-commerce heavy goods: use as rugged inner with bubble and paper void.

Choosing thickness, style & closure

Thickness (approx.) Style Closure Typical contents Notes
60–80 µ (240–320 g) Open-ended / Grip Tape / Grip / Heat seal Hardware kits, dense books, components Everyday heavy duty; good puncture resistance
90–125 µ (360–500 g) Open-ended / Gusseted Heat seal / Cable tie Tools, castings, bulky soft goods Greater tear resistance; popular for export inners
150–200 µ (600–800 g) Gusseted / Sack Cable tie / Tape Industrial parts, heavy textiles, irregular shapes Maximum robustness; consider MDPE for stiffness

Need lighter film? See Light Duty Polythene Bags. For edge protection use Cardboard Sheets or corner boards inside the outer.

Packing & sealing tips

Right-size the bag: avoid over-stretching; choose gussets for boxy loads.

Seal method: heat seal for secure containment; for service kits use grip-seal plus secondary tape.

Layering: add bubble wrap around sharp elements before bagging.

Related packaging essentials

Boxes & crates

Double Wall Boxes · Pallet Boxes

Protection

Bubble Wrap · Paper Void Fill · Cardboard Sheets

Labels & docs

Thermal Labels · Printer Address Labels · Documents Enclosed Wallets

Heavy Duty Poly Bags – Frequently Asked Questions

Primarily LDPE (flexible, clear) or MDPE (slightly stiffer, more opaque). Both offer improved tear and puncture resistance at higher microns.

60–80 µ for dense books and small hardware kits; 90–125 µ for tools and bulkier components; 150–200 µ for very heavy or irregular shapes.

They are best used as inners inside a rigid outer (e.g., double wall box). Use an outer for carrier compliance and stacking strength.

Yes—gusseted heavy duty bags provide extra capacity for bulky or boxy items, and custom sizes are available.

Yes—open-ended bags can be heat sealed. Apply shipping labels to the outer carton; use internal ID labels or tags on the bag as needed.

PE films are widely recyclable where facilities exist. Remove paper/adhesive labels before recycling and follow local guidance.

Yes—branding, warnings and special films (e.g., antistatic, corrosion-inhibiting) can be made to order. Share item details and volumes for a quote.