Export garment poly bags often carry a row of small round or butterfly-shaped openings — air holes. A buyer spec may simply say to punch holes, leaving the diameter, shape and position to the supplier’s experience. This guide explains why garment bags are vented and how to choose the hole shape, size and layout.

First, a reality check: air holes are not required on every pack. Whether to vent depends on the target market and buyer spec, the garment inside and the shipping mode — punching blindly only weakens the film and invites dust and moisture.

1. Three Real Reasons to Vent

  • Child safety: for packaging that children may reach, several markets require plastic bags to let air through and reduce suffocation risk — regulations and buyer manuals often specify open area and position, so confirm market by market;
  • Air release: sealed bags puff up with trapped air; holes let it escape so the bags lie flat, pack and stack better and take less storage space;
  • Moisture management: holes do not waterproof a bag, but they equalise humidity and reduce condensation from temperature swings; for long sea freight, sealed bags with desiccant remain the main defence.

    • 2. Common Hole Shapes and Sizes

    Hole shapeTypical size (ref.)Characteristics & use
    Round3–10 mm dia.Most common; size follows air-flow or safety needs; small holes suit light T-shirt bags
    Butterfly (two circles + slit)Large opening, fast releaseA favourite on garment bags; neat and resists tearing further
    Slot / ovalLarge vent areaFor bulkier garments or thicker film
    Micro holesNearly invisiblePremium and dust-bag packaging: breathable yet discreet, with minimal strength loss

    The table shows common references; the final size, total open area and test method follow the buyer spec or target-market standard — send the spec with your enquiry and we sample to it.

    3. Placement and Layout Rules

  • Keep clear of heat-seal zones: leave enough distance from the seal so it stays strong and airtight;
  • avoid the main print area and barcodes — holes must not cover information;
  • spread evenly — along the centre or diagonally — for balanced strength; too many holes weaken the film noticeably;
  • never punch on gusset folds or welds, and the whole batch must match the approved sample.

    • 4. Strength After Punching & How to Verify It

    Punching creates weak points in the film: the larger or denser the holes and the thinner the film, the lower the tensile and drop resistance. When both venting and strength are needed, prefer a slightly thicker film or smaller, sparser holes rather than fixes after the fact. Verification is simple: pack a sample garment, lift the bag, simulate drops and stacking, then check whether the holes tear or propagate.

    5. Ordering Checklist

  • target market and buyer spec: safety and venting requirements and the test method;
  • hole shape, diameter and a drawing with edge and seal distances;
  • film thickness and bag type (flat, self-seal or zipper), with print kept clear of the holes;
  • sample approval (packing, sealing and drop test), then per-batch spot checks of hole position and edges.
    • 💡 TAGE’s garment bag workshop punches OPP, PE and CPE bags — flat, self-seal or zipper — to your drawing, with printing and punching done in one pass for precise hole placement. Trial orders are flexible and sampling takes 3–7 days. Send the bag type, film thickness and hole drawing to start.

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