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Sacks; Bags [sacks] for packaging materials in bulk, Sacks for the storage of materials in bulk, Sacks for the transport and storage of materials in bulk; Flexible intermediate bulk containers [sacks] for storing and transporting materials in bulk; Packaging bags (sacks) of plastic for bulk storage and transport; Packaging sacks for storing materials in bulk, Packaging sacks for transporting materials in bulk; Valve sacks with an opening for filling by means of a filling spout; Sacks for packaging, storing and transporting materials in bulk, with an opening for filling by means of a filling spout; Sacks for packaging, storing and transporting materials in bulk, with an opening for filling by means of a filling spout and with a tear-off strip with closure for resealing; Sacks for packaging, storing and transporting filling materials, with an opening for filling by means of a filling spout and with a tear-off strip with optional closure for resealing, whereby the tear-off strip is optionally attached to the filling end or to another end of the sack; Valve sacks with an opening for filling by means of a filling spout and with a tear-off strip with optional closure for resealing, whereby the tear-off strip is optionally attached to the filling end or to another end of the sack; Open sacks; Open sacks with an opening for filling by means of a filling spout and with a tear-off strip with optional closure for resealing, whereby the tear-off strip is optionally attached to the filling end or to another end of the sack