This definition appears very rarely
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Samples in periodicals archive:
Rite-Way Packaging supplies bags that are made up of any of the following constructions; Pasted Self Opening Square (PSOS) 1) Pasted "block" bottom. 2)...
Pasted Open Mouth - Satchel Bottom. Pasted Stachel Style 1 Bottom. Open end flush cut. 2. POM 3. No gusset. PSOS - Pasted Self Opening Square
Paper Pasted Self Opening Square bags are commonly used for wood products such as wood shavings and wood fibers and are typically closed by sewing the tops.
Pasted Self Opening Square (Psos) View Detail Get Quotes. Woven Polypropylene Bags. View Detail Get Quotes. Specialty Packaging/folding Carton. View Detail...