Pre Made Sacks

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RKW ProVent® (Weatherproof sacks, plastic, for powdery products)

  • Weatherproof plastic sacks with 40 times the moisture protection of paper
  • Extremely strong, tear and puncture resistant for safe transport and handling
  • Integrated venting system allowing de-aeration
  • Significantly extends shelf life and can be stored outside
  • Clean and easy handling with little or no product loss
  • Enhanced print quality with up-to 10 colour flexographic printing
  • Total cost reduction and enhanced sustainability
  • Available in FFS (reeled) or Pre-made sacks

RKW originally developed ProVent® 10 years ago as an efficient, sustainable, weatherproof and durable alternative to conventional paper packaging for powdery and moisture sensitive goods. The ProVent ® plastic sack significantly improves the filling, transporting, storing and distributing process of powdery and moisture sensitive goods whilst allowing de-aeration through an integrated venting system that ensures no dust, dirt or moisture can penetrate from the outside, whilst only allowing air to escape from the inside.

What’s more, RKW ProVent® plastic sacks are much more environmentally friendly than paper sacks. The production of the RKW ProVent® pack consumes 14 % less energy than paper sacks. Just 20% of the typical amount of waste water and water pollution is produced, and because no composite materials are used, recycling is simple and inexpensive. In comparison to paper sacks, recycling a tonne of plastic takes up just 10 % of the otherwise required amount of energy.

With over 350 million sold, the RKW ProVent® family of products is today the top-selling solution for the packing and marketing of powdery goods in the building materials, construction, chemical and food industries.

ProVent Advanced: RKW Provent® Advanced is the premium solution for the high demands of brand manufacturers. The new, fully integrated venting system has a seam-free front, which means no-compromises have to be made on the print design. For an unmistakable and convincing brand presence at the point of sale!

ProVent Flex: Flexible to the full: With its continuous print image and the flexible venting concept, the RKW ProVent® allows sacks of different lengths to be produced in one production run. Like the entire RKW ProVent® product family, the RKW ProVent® Flex is easy to use and it offers excellent machine processing together with very high filling speeds.

ProVent Classic: Proven over more than 10 years, this popular classic features the well-known venting system. The RKW ProVent® Classic supports a high print quality and like the entire product family offers a high level of functional safety. All sacks are burst and tear proof and remain robust even when subjected to higher loads.


  • Less dust leakage: Higher occupational safety, lower maintenance and cleaning costs
  • Lower personnel costs: Simple handling means less work
  • High customer satisfaction: Less material damage, enhanced shelf-life, reduced rework time and associated costs
  • Perfect stackability: Due to non-slip packaging surfaces and permanent positive venting
  • Safe outdoor storage: Water barriers and UV protection make the packaging weatherproof even when uncovered
  • Better branding opportunities and a high recognition factor: Provent® Packaging can be printed in up to 10 colours

FFS films are supplied as side-folded tubes on rolls. The excellent machinability means high filling performance:

up to 2,400 bags p/hr!
Widths: 250 to 500 mm
Side-fold (gusset) depth: 40 – 85 mm
Volumes: 10 – 100 litres

Pre Made sacks are supplied as flat packed singles with one end welded ready for manual/hand or automated packing.