Short answer: choose flat-bottom (8-side seal) for premium retail where the bag has to stand square and block a shelf; stand-up (doypack) for the widest range of fill weights and the easiest route to a filling machine; side-gusset when you ship 1 kg wholesale packs and freight cube matters more than shelf presence. Instant coffee and single-serve formats use 3-side seal sachets, which is a different conversation.
The three formats, briefly
Stand-up pouch (doypack). Front and back panels, a folded bottom gusset that opens into an oval base, and a top seal β usually with a zipper. It stands on shelf once filled, packs flat before filling, and is compatible with most vertical form-fill-seal equipment.
Flat-bottom / 8-side seal (box pouch). Four side panels plus a structured rectangular base. It stands dead square, takes print on the gussets as well as the face, and looks the most like a boxed product. The base is formed by extra seals, so it is a more complex bag to make.
Side-gusset. Two side folds, flat front and back β a brick shape once filled. Minimal branding area, maximum product per unit of volume, and the most freight-efficient of the three for large fills.
Comparison
| Β | Flat-bottom (8-side seal) | Stand-up (doypack) | Side-gusset |
|---|---|---|---|
| Shelf presence | Best β square, tall, blocks out competitors | Good, but leans slightly as it empties | Poor β reads as bulk |
| Typical fill weights | 250 g β 1 kg | 100 g β 1 kg | 500 g β 5 kg |
| Branding area | Largest (front, back and both gussets) | Front and back only | Front and back only |
| Filling equipment | Premade-pouch filler; check jaw and gripper compatibility | Widest compatibility, including many VFFS lines | Premade-pouch filler, wide jaw |
| Valve placement | Front panel, clear of corner creases | Front panel, upper third | Requires care β flat area is limited |
| Freight cube efficiency | Good β packs into a firm block | Fair β rounded base wastes space | Best |
| Relative unit cost | Highest | Middle | Lowest for large fills |
| Best channel | Specialty retail, single origin | Retail, e-commerce, subscriptions | Wholesale, food service, export |
How to choose, by channel
Specialty retail shelf. Flat-bottom. A square bag holds its shape all the way down the panel, prints on four faces, and stands next to a competitor without sagging. If your brand competes on the shelf, this is the format that buys you the most visible area.
E-commerce and subscriptions. Stand-up. It survives a mailer, packs flat before filling, and the cost per unit is lower. The slightly rounded base costs you nothing when nobody sees it in a row.
Wholesale 1 kg and export. Side-gusset. A pallet of side-gusset bags carries meaningfully more coffee per container than the same pallet of stand-up pouches, and the freight saving usually beats the branding loss at this volume.
Instant and single-serve. 3-side seal sachets, on high-speed form-fill-seal. Nothing else competes on cost per unit at that fill weight.
Things buyers forget until the sample arrives
- Your filler decides the format. Flat-bottom pouches need a premade-pouch machine with the right gripper spacing and seal jaw width. Confirm the machine before you approve artwork β changing format after tooling is expensive.
- Zipper position changes the fill. A zipper placed high leaves more headspace for degassing but reduces usable volume; placed low, it gets contaminated by grounds.
- Valve plus zipper plus tear notch all compete for the same panel. On a 250 g stand-up pouch there is less room than the artwork suggests. Lay out the mechanical features on the dieline before designing the front.
- Case pack and pallet pattern. Ask for the packed carton dimensions, not just the bag dimensions. Freight is quoted on cartons.
What actually changes if you switch formats
Switching between stand-up and flat-bottom is not a bag swap. Budget for these before you decide:
- Tooling and plates. A new dieline means new cutting and sealing tooling, and β for rotogravure β a new set of print cylinders per colour. This is the single largest one-off cost and it is charged per format, not per design revision.
- Artwork rework. Gusset panels on a flat-bottom bag are printable; a stand-up artwork does not simply stretch onto them. Expect a redesign of the layout, not a reflow.
- Filler parts. Gripper spacing, jaw width and vacuum cups are format-specific. On a premade-pouch machine these are usually change parts rather than a new machine, but they have a lead time of their own.
- Case count and freight. The same fill weight gives different carton dimensions in each format, which changes your pallet pattern, container utilisation and landed cost.
- QC re-qualification. New bag geometry means new seal-strength and drop-test baselines. Run those before the first commercial batch, not after.
If the plan is to test a format, run the pilot with your real filling line and your real coffee β an empty-bag sample tells you almost nothing about seal performance on an oily dark roast.
What we supply
Xiangyi Packaging produces all three formats for coffee β 8-side seal flat-bottom bags, stand-up pouches with zipper and valve, and side-gusset bags for bulk β in foil, metallized, clear and kraft laminates. Minimum order is 10,000 pieces for multi-layer barrier pouches and 5,000 for simpler printed bags; plain stock bags start at 1,000. Quality systems are certified to ISO 9001:2015 and ISO 22000:2018.
We check the gripper pitch and jaw width of your filling machine against the dieline before quoting, so the format is confirmed against equipment rather than assumed.
Next step: tell us your fill weight, the channel you sell through, and the filling machine you have (or plan to buy). We will recommend a format, send the dieline, and quote it β including the freight difference, which is often larger than the bag price difference. See the coffee packaging range Β· 8-side seal flat-bottom bags
Frequently asked questions
Can a flat-bottom bag be filled on a vertical form-fill-seal machine?
Generally no β flat-bottom pouches are premade and filled on pouch fillers. Check your machine's gripper pitch and jaw width before committing to the format.
Which format holds a degassing valve best?
Stand-up and flat-bottom both work well; the flat-bottom gives you more flat panel area. On side-gusset bags the usable flat area is smaller, so valve placement needs designing in early.
Is flat-bottom worth the extra cost?
If the product is sold on a shelf next to competitors, usually yes. If it is sold online or in bulk, the extra cost buys you very little.
Can I get the same artwork on all three formats?
The artwork can be shared, but the dieline cannot: each format has different panels, seal areas and fold lines. Expect to adapt, not simply reuse.