Choose a polyethylene bag style by matching the product geometry and the way employees or equipment dispense, open, load, close, move, and store the package. Flat bags suit thin or relatively uniform products. Gusseted bags add depth for bulky or box-shaped contents. Bags on rolls organize one-at-a-time dispensing, while separated bags can simplify manual presentation or kitting.

Style, dimensions, seal construction, perforations, winding direction, and pack-out should be qualified together.

Begin with the product or container geometry

Measure the widest, deepest, and tallest points, including protrusions, irregular corners, and loading clearance. If the bag is a liner, measure the container's internal geometry and define the required cuff, overhang, fold, or tie-off.

Use the same measurement convention on the drawing, quote, purchase order, and approved sample. Champion Plastics' Build A Bag guide provides formulas for boxes, round containers, square containers, and pallet covers, but samples should still be tested on the actual item.

When a flat bag fits

A flat bag has width and length before filling. It can be efficient for thin, flexible, or relatively uniform products such as components, garments, documents, and portions that do not require substantial side depth.

Flat bags are straightforward to count, stack, label, and seal and can be supplied separately or on rolls. Their limitation is depth. If the bag must stretch around a thick or boxy product, it can become tight at corners, lose usable length, or place stress near the seals.

When a gusseted bag fits

A gusset is a fold that expands to create depth. Gusseted bags can better accommodate cartons, containers, bulky products, and liners that need to open into a three-dimensional shape.

The specification must define width, gusset depth, and length using a shared convention. A phrase such as “12-inch gusset” can be ambiguous if one party means total expanded depth and another means the fold on each side. Include a dimensioned drawing or approved sample.

Gussets affect opening, folding, printing, vent placement, sealing, and pack-out. Test whether operators can open them consistently and whether the bag seats correctly in the container without trapping product.

Bags on rolls

Rolls can keep bags organized, support one-at-a-time dispensing, and reduce loose inventory at a workstation. Perforations allow employees or equipment to separate each bag. Coreless rolls eliminate a separate core but can change dispenser and handling requirements.

Specify bags per roll, roll diameter, core size or coreless construction, winding direction, opening orientation, perforation location and strength, and packaging. A perforation that is too weak can break during handling; one that is too strong can slow employees or distort the bag.

Separated bags

Individually separated bags can suit manual loading, work-cell presentation, kitting, or operations where a dispenser is not practical. They may be stacked, bundled, folded, or packed in cartons.

Define the count, orientation, fold, opening direction, labels, bundle or carton presentation, and any cleanliness or handling requirement. On a high-volume line, consistent presentation can matter as much as the bag dimensions.

Seal construction carries the load

Champion Plastics lists tubular, sideweld, gusseted, and specialty configurations. Seal location can affect load distribution, appearance, opening, and equipment interaction.

Describe where the product rests and how the open end is closed. If the customer heat seals the bag, provide equipment, temperature, dwell, pressure, seal width, contamination risk, and required integrity. Thickness alone does not determine seal performance; material, additives, surface condition, settings, and product contamination also matter.

Add features only when the workflow requires them

Vents, perforations, folds, colors, printing, warnings, and identification should each solve a defined problem. Vents may release trapped air but change containment, cleanliness, or moisture exposure. Printing may improve instructions or traceability but must avoid folds, seals, and high-distortion areas.

Create a controlled drawing that shows each feature, dimension, location, and tolerance. Review the effect on converting, opening, sealing, equipment, and end use.

Run a workstation trial

  • Give representative samples to the people or equipment that will use them. Observe the process rather than relying only on a general preference.
  • Time to dispense, separate, open, load, close, and place the package.
  • Blocking, static, snagging, dropped bags, or extra motion.
  • Fit at the maximum product or container size.
  • Seal, gusset, vent, and perforation behavior.
  • Dispenser changes, equipment interference, or ergonomic concerns.
  • Printing, label, or barcode readability after filling.
  • Scrap, rework, and inventory-control effects.

Define pack-out and logistics

Specify bags per roll or bundle, rolls or bundles per carton, labels, lot identification, carton weight, pallet quantity, stretch wrapping, and storage protection. Confirm the largest roll diameter and carton weight the receiving and production teams can handle.

What to send for a bag-style quote

Provide the product or container dimensions, photos or sample, maximum weight, loading method, closure, preferred flat or gusseted geometry, roll or separated presentation, roll and perforation details, seal orientation, vents or printing, pack-out, quantity, and trial requirements.

Discuss your specification with Champion Plastics

Champion Plastics manufactures flat, gusseted, tubular, sideweld, roll, coreless, separated, and specialty polyethylene configurations. Call 800-526-1230 or use the Build A Bag guide to review dimensions, dispensing, seals, features, and pack-out.