Direct Answer
Paper bag making machines are classified by the bag they produce: square bottom (SOS), V bottom, flat and satchel, twisted handle, flat handle, and fully automatic. Square bottom machines make self-opening retail bags; V bottom and flat machines make simpler grocery sacks; handle machines add twisted-paper or flat handles for premium carry bags. Kraft paper is the standard material, with basis weight and ply count setting load capacity. Choose by bag style, handle type, and the automation level your volume justifies.
Opening Hook
A packaging distributor was buying pre-made bags at a margin thin enough to see through, until a retail client asked for custom square-bottom bags with twisted-paper handles and a two-week turnaround. Owning the right machine type turned a commodity resale into a value-added product line. At yoco-group, we know the bag machine you choose defines the customers you can serve. Here's a complete map of paper bag making machine types, so you buy the one that opens the right doors.
Bag Styles: The Machine's Identity
Every paper bag machine type exists to produce one bag construction. Knowing the styles tells you which machine matches which market.
Table: Paper Bag Styles and Their Machines
| Bag Style | Construction | Typical Use |
|---|---|---|
| Square bottom (SOS) | Flat, self-opening bottom | Retail and grocery shopping bags |
| V bottom | Pointed, glued V-fold bottom | Simple grocery sacks, bread bags |
| Flat / satchel | No gusset, flat construction | Lightweight, low-cost bags |
| Twisted handle | Twisted-paper cord handle | Premium retail carry bags |
| Flat handle | Flat paper or reinforced handle | Boutique and gift bags |
Square Bottom vs V Bottom: The Core Trade-Off
Square bottom (SOS) bags stand up on their own and open with one hand; V bottom bags are simpler and cheaper but don't self-open. The choice defines your product tier.
Table: Square Bottom vs V Bottom
| Attribute | Square Bottom (SOS) | V Bottom |
|---|---|---|
| Self-opening | Yes | No |
| Stands upright | Yes | No |
| Production cost | Higher | Lower |
| Market | Retail, grocery | Commodity, bakery |
Handle Machines: Adding Value to the Same Paper
Handles turn a plain bag into a premium product. Twisted-paper and flat handles are the two main styles, and each requires its own attachment station or a dedicated machine. For how this complements other converting equipment, see our paper cup forming machine guide.
Table: Handle Types for Paper Bags
| Handle Type | Material | Feel / Market |
|---|---|---|
| Twisted paper | Twisted kraft cord | Retail, grocery premium |
| Flat paper | Flat reinforced strip | Boutique, gift, luxury |
| Rope / die-cut | Mixed materials | Specialty, branded |
Materials and Specs: Kraft, Ply, and Automation
The paper you run sets load capacity, and the automation level sets your labor cost. For the cutting and finishing that feed bag lines, see our die cutting machine guide.
Table: Key Paper Bag Machine Specifications
| Specification | What to Check |
|---|---|
| Bag width & length range | Covers your target sizes |
| Paper basis weight | 40–120 g/m² typical; heavier for multi-ply |
| Ply count | 1–3 ply; more ply = more strength |
| Handle capability | Twisted, flat, or none |
| Automation level | Semi-auto vs fully automatic |
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