SOS paper bags are one of the most recognisable packaging formats in the food retail industry. From grocery stores and delis to bakeries, cafes, and specialty food shops, these flat-bottomed, self-opening bags are a staple in commercial food packaging worldwide. But not all SOS bags are the same — and choosing the wrong specifications can cost you money, fail food safety requirements, or disappoint your customers.
This complete guide explains what SOS bags are, the different types and features available, and exactly what to look for when buying wholesale.
What Does SOS Stand For?
SOS stands for “Self-Opening Satchel” — a reference to the bag’s flat, square bottom that allows it to stand upright and open by itself, making it easy to fill quickly in high-volume food service environments. The flat bottom provides stability that gusseted or pinch bottom bags do not offer.
Types of SOS Paper Bags
Standard SOS Brown Kraft Bags
The classic format — brown food-grade kraft paper in 50–60GSM, available with grease-proof or one-side coated options. Used for bakery goods, coffee, flour, dry goods, and general grocery. Our SOS Brown Kraft Paper Bags are available with serrated or standard tops, in custom sizes with full-colour printing.
SOS White Kraft Bags
Premium white kraft paper bags that provide a cleaner, more upscale presentation — ideal for artisan bakeries, specialty coffee roasters, organic food brands, and premium grocery retailers. Our SOS White Kraft Paper Bags are available in 40–120GSM with grease-proof coating and custom printing.
SOS bags with tin-tie closure and OPP window — ideal for coffee, flour, and specialty food retail
Tin Tie SOS Bags
Tin-tie closures add a resealable wire strip to the top of the bag, allowing customers to open and re-close the bag multiple times — essential for coffee, flour, tea, chocolate, and any product that the customer will use over several days. Our Tin Tie Bags with Window are available with offset OPP window for product visibility, and flexo printing up to 7 colours.
Window SOS Bags
A clear OPP (oriented polypropylene) window is heat-sealed into the front panel of the bag, allowing customers to see the product inside. Window bags significantly increase purchase conversion on retail shelves — studies consistently show consumers buy more when they can see the actual product rather than just the packaging. Available in combination with tin-tie closures.
Key Specifications to Look For
| Feature | What to Check |
|---|---|
| Food Safety | Confirm food-grade paper, water-based inks, and food-safe glue |
| Grease-proof Coating | Must be fluorine-free if required — confirm with supplier |
| GSM | 40–60GSM for standard food use; 80–120GSM for heavier goods |
| Top Style | Straight top, serrated top, or tin-tie — depends on your application |
| Printing | Flexo printing up to 7 colours; confirm ink is water-based |
Common Applications by Business Type
- Bakeries: Standard SOS brown kraft with grease-proof coating for bread, pastries, and baked goods
- Coffee roasters: Tin-tie white kraft with window for whole bean and ground coffee retail
- Grocery stores: Standard brown kraft in multiple sizes for bulk dry goods and produce
- Specialty food brands: White kraft with window and premium printing for artisan food retail
- Tea and herb retailers: Tin-tie bags with OPP window for loose-leaf tea, herbs, and spices
Ready to Order Custom Paper Bags?
NextGen PaperBags manufactures directly from China and ships to the USA, Canada, and Europe. Get factory-direct pricing with full customization.