Essential packaging materials in industry, serving to resource saving.
Our “Heavy duty bags” are heavy duty bags made of sack Kraft paper or polyethylene for industrial use that have been used to pack items in heavy weight around 20 kg, such as petrochemical products, flour, food, feed, fertilizer, and other powder and granular foams.
Heavy duty bags first came into use in the early Showa Era in Japan. Although there was a period of time when their use decreased due to the shift to bulk-transportation using flexible containers and lorries, they have remained one of the most important packaging materials supporting industry because of their capability to deliver products in small volume and to flexibly respond to end-users’ requirement.
Sack Kraft bags are made of sack Kraft paper, a recyclable material, and bags with polyethylene liner or aluminum inner bags can be manufactured to achieve better function depending on our customer’s product.
Heavy Duty Bags made by Ohishi Sangyo

We have been manufacturing heavy duty packaging bags since 1949, and with our proven track record, our solid technical capabilities and ability to make proposals have enabled us to provide high-quality, environmentally friendly products to customers in Japan and overseas.
Pasted Bottoming Bag
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Single Bottoming Bag
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Valve Bag (Sealed)
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Valve Bag (Pasted Valve Bag 25kg, small bag less than 25kg)
Sack Kraft bag - Sewn bag / Over-Taping Bag
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Sewn bag
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Sewn bag with Over-Taping
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Excella Bag
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EF Bag (Excella Fold Bag)
Sack Kraft bag - Pull Bag / Double Folded Bag
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Pull Bag
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Double Folded Bag
Sack Kraft bag - IKKI KAIFU Bag®
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IKKI-KAIFU Bag (Pasted Valve spec)
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IKKI-KAIFU Bag (Pasted Valve+ spec)
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IKKI-KAIFU Bag (DF spec)
Sack Kraft bag - High Barrier
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High barrier - Polyethylene Film
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Inner liner with score cut application
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High barrier (Foil)
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Inner liner (Micro-Perforation)
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After-printing process
Polyethylene heavy duty bags - Hand -made process
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PE inner bag (Manual insertion)
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Mono-layer bag
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Three-layer bag
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Handy-Cut specification
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Micro-Perforation process
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Bag with Biomass Resin (Polyethylene made of rice or millet)