Size a paper food bag from the largest real product it has to hold, not from a supplier's size list, and check how each supplier writes the dimensions, because flat, gusseted, SOS and cone bags are measured differently. Ordering from a list is how chains end up with a croissant bag that crushes the croissant and a roll bag that swallows two rolls with room to spare. This guide explains how each format is measured, how to size from your own products, and gives indicative sizes for common items. It is part of the wider guide to custom printed paper food bags.
How are paper food bag sizes written?
Flat bags are written as width x length; side-gusset bags as width + gusset x length (for example 12 + 5 x 24 cm); SOS-style bags as width x depth x height; and cones by top opening and length. Width is always measured across the bag face, and length from the bottom to the open mouth.
| Format | Notation | What each number means |
|---|---|---|
| Flat bag | W x L | Face width x length from bottom fold to mouth |
| Side-gusset bag | W + G x L | Face width + total gusset depth (fully opened) x length |
| SOS mini / satchel bag | W x D x H | Base width x base depth x height to mouth |
| Cone bag | Top opening x length | Width of the open top (flat) x length to the point |
| Half-open or sleeve bag | W x L (plus cut height) | Face width x longest side; the lower side is specified separately |
Watch for two sources of confusion in quotations:
- Some suppliers quote gusset as each side's fold depth, others as the total; ask which.
- Some include the bottom fold-over or a lip in the length; others measure the usable height. Ask whether the length is the flat blank or the finished bag.
German specifications often use the same width + gusset x height form (Breite + Falte x Höhe) for Faltenbeutel, which makes comparison straightforward. US suppliers usually quote in inches, and SOS bags use a numbered system explained in SOS bags explained.
When should you choose a flat bag and when a gusseted bag?
Choose a flat bag for thin or single items that lie flat (pastries, cookies, pretzels, sandwiches, fries portions), and a side-gusset bag when the product has real depth or several pieces go in together (rolls, buns, bread, muffins). The gusset adds volume without making the bag wider.
| Question | Flat bag | Side-gusset bag | SOS mini / satchel |
|---|---|---|---|
| Product thickness | Up to about 3-4 cm handles well | Thicker or multiple items | Bulky or must stand upright |
| Paper use | Lowest | Moderate | Highest; usually heavier paper |
| Counter speed | Fastest to open and fill | Fast with serrated mouth | Stands open for filling |
| Stands on its own | No | Partly when filled | Yes |
| Typical items | Croissant, cookie, pretzel, sandwich, fries | Rolls, loaves, baguettes, multiple pastries | Doughnuts, muffins, deli items, fries in US formats |
A flat bag can be made a little wider to take a thicker item, but beyond a certain depth the product distorts the bag and pushes it open. That is the point to move to a gusset.
How do you calculate the right bag size from your product?
Measure the product at its largest (width, thickness and length), then add allowances: the bag face must accommodate width plus thickness, the length must include the product plus a fold-over or grip area at the top, and a gusset should roughly match the product's thickness.
A simple method that works for most food bags:
- Measure the largest version of the product, after baking or filling, not the nominal size.
- Flat bag width: product width + product thickness + roughly 1-2 cm ease.
- Gusset bag: face width close to product width plus a little ease; total gusset close to product thickness.
- Length: product length + roughly 3-6 cm for a fold-over or for the hand to grip the top. For open-top or half-open bags where part of the product should show, reduce accordingly.
- Fill a sample with the real product and check that staff can load it in one movement without tearing.
These allowances are starting points; the final dimensions should be confirmed with samples, because soft products, icing and sauces behave differently from rigid shapes.
Indicative paper food bag sizes for common products
The table below gives starting dimensions for common bakery, sandwich and snack items. Product sizes vary widely between bakeries and recipes, so treat these as indicative and confirm against your own items.
| Product | Format | Indicative size (cm) | Indicative size (inches) |
|---|---|---|---|
| 1 croissant or Danish | Flat | ~14-16 x 20-24 | ~5.5-6.3 x 8-9.5 |
| Cookie, small pastry | Flat | ~10-12 x 14-16 | ~4-4.7 x 5.5-6.3 |
| Pretzel | Flat | ~16-20 x 20-24 | ~6.3-8 x 8-9.5 |
| Doughnut (1-2) | Flat or SOS mini | ~14-16 x 18-22 (flat) | ~5.5-6.3 x 7-8.7 |
| 1-2 rolls | Side-gusset | ~10-12 + 5-6 x 22-26 | ~4-4.7 + 2-2.4 x 8.7-10 |
| 4-6 rolls | Side-gusset | ~14-16 + 7-8 x 30-35 | ~5.5-6.3 + 2.8-3.1 x 12-14 |
| Loaf of bread (500 g-1 kg) | Side-gusset, often window | ~16-20 + 8-10 x 35-42 | ~6.3-8 + 3.1-4 x 14-16.5 |
| Baguette | Long side-gusset | ~9-10 + 4-5 x 55-65 | ~3.5-4 + 1.6-2 x 21.5-25.5 |
| Baguette sandwich / sub | Flat or narrow gusset | ~9-12 x 30-45 | ~3.5-4.7 x 12-17.7 |
| Toasted sandwich, panini | Flat, often grease-resistant | ~16-20 x 18-24 | ~6.3-8 x 7-9.5 |
| Fries portion (small to medium) | Flat or cone | ~10-14 x 16-20 (flat) | ~4-5.5 x 6.3-8 |
| Döner in pide | Half-open flat | ~16-20 x 18-26 | ~6.3-8 x 7-10 |
Döner and dürüm sizes, with the features that go with them, are covered in the kebab and döner bags guide, and how a bakery chain groups these sizes into a range is covered in the bakery bags guide.
How does bag size affect paper weight?
Larger bags, longer bags and bags that carry heavier contents need heavier or stronger paper, because load and handling stress grow with size. Small flat bags for single items commonly use paper at the lighter end of the 30-50 gsm range; bread, baguette and SOS-style bags tend towards the upper end or above.
Size also interacts with barrier choice: a small grease-resistant bag adds little cost per unit, but specifying the same barrier on a large bread bag that only ever holds dry loaves adds cost for no benefit. If a window is used, its size is limited by the face width and must stay clear of gussets and folds; see window paper bags: film options and recyclability.
How many food bag sizes should a chain stock?
Fewer than most chains start with. Many bakery and snack operations cover their range with four to eight sizes across flat and gusseted formats, and consolidating sizes that differ by only a centimetre or two rarely affects service.
How to rationalise a range:
- List every product by its largest real dimensions, then group products that fit the same bag with sensible ease.
- Merge sizes within about 2 cm of each other in width unless a product clearly needs the smaller fit for presentation.
- Keep the same paper and print colours across sizes where possible; this lets sizes run together and keeps branding consistent.
- Check that bag sizes fit inside your takeaway bags and delivery bags; see takeaway bag sizes.
The same principle applied across boxes and containers is described in how to reduce takeaway packaging SKUs, and how size count affects setup costs is explained in what determines MOQ in custom packaging.
Food bag sizing checklist
Before requesting a quotation, prepare for each bag:
- Product(s) and their largest real dimensions (width, thickness, length).
- Format: flat, side-gusset, SOS mini, cone or half-open.
- Proposed size in the correct notation, with gusset defined as total or per side.
- Whether length is the finished bag or includes a fold-over or lip.
- Any window and its position.
- Paper preference and barrier level.
- A sample bag from your current supplier, if you have one, marked "keep" or "change".
Use this with the custom printed paper food bags hub to complete the full specification, or send your size list for a quotation.