Where the seal is placed changes the bag
Bottom-seal bags have a seal across the bottom edge and an open top. Side-seal bags are formed and sealed along the side edges. Material orientation, appearance, loading and machinery determine the better option.
Questions to ask
- Where should the opening be?
- How will the bag be filled?
- Does the product create concentrated stress?
- Is presentation or a clean side edge important?
- Is a gusset required?
Bottom seal or side seal: choose by load and presentation
Seal position affects loading, appearance, strength distribution and machinery. The right construction depends on the packed product, bag orientation, film material and closure requirement.
Request a specification quoteBuyer checklist
- Bottom seals suit many general-purpose flat and gusseted bags.
- Side seals can support clean presentation and specific converting formats.
- Sharp or heavy products require trials regardless of seal position.
- Seal width, temperature and contamination affect strength.
- Confirm the opening edge, print orientation and packing direction.
Quick comparison
| Format or check | Specification | Typical purpose |
|---|---|---|
| Bottom seal | General packing, liners and sacks | Load direction and bottom impact |
| Side seal | Retail, garment and presentation bags | Edge alignment and opening direction |
| Three-side seal | Pouches and barrier structures | Filling edge and final closure |
Discuss this requirement with a packaging manufacturer
For production feasibility, samples and commercial supply, compare your written requirement with the relevant Tanvir Packages manufacturing capability.
Frequently asked questions
What information should be sent before requesting a quotation?
Send the application, packed product, material preference, finished dimensions, thickness, construction, printing, quantity, packing and delivery city.
Should a production order be approved from a sample?
Yes. A signed sample or trial should represent the agreed material, dimensions, thickness, seal, appearance and print before repeat production.
Are online calculations final production specifications?
No. Calculators and guides provide estimates. Final values should be confirmed against the approved material, tooling, tolerances and production sample.