How to Measure a Flat Poly Bag

By September 1, 2025flat poly bag

Accurate numbers for flat poly bag

Before placing an order for a flat poly bag from TDI Custom Packaging, it’s crucial to gather precise specifications. These measurements require width, length, and gauge. That sounds obvious, right? But it might be trickier than you think.

Width and Length

image of a flat poly bag with details outlinedImportantly, you will need to measure the right width and length. With a custom bag that is too tight for especially bulkier products, you may have to force contents inside. On the other hand, excessive space could lead to items sliding around causing potential damage.

Ensure the dimensions are as accurate as possible, even down to one-tenth of an inch! Additionally, exclude the area beyond the skirt or the side seams, and focus solely on the usable portion of the bag.

Gauge or Thickness

The gauge of a poly bag refers to its thickness, typically measured in mils (1 mil = o.oo1 inch) or microns (1 µ= o.oo1 millimeter).

Generally, gauge determines the strength and durability of the bag, with a higher gauge indicating a thicker and more robust material. 

Size Ranges of TDI’s Flat Bags

  • Width:  minimum 1.25 inch (1.25″) | maximum 40 inches (40″)
  • Length: minimum 5 inches (5″) | no maximum
  • Gauge:  minimum 1 mil. | maximum 15 mil.

Specifications of other Bag Products

perforated layflat tubing

TDI Custom Packaging produces a variety of unique plastic bags that each have different specifications. For instance, the width of layflat tubing cannot just be measured while the product lays flat; there’s more to it. 

About layflat tubing and how to measure it >>

Due to the intricacies involved in measuring a packaging product, we recommend consulting with our team first to ensure precision.

Still Not Sure About Your Flat Poly Bag Size?

If this is your first time purchasing a custom flat poly bag and you’re unsure about how to obtain the correct measurements, don’t worry! 

micrometer to measure the gauge of a flat poly bagPlease feel free to reach out to our team for further guidance in determining the right specifications.

Contact Us Today for Assistance >>

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YouTube – Can U Show Me How: how to measure bags >>