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Some glue bag sealers can heat seal the inside of paper bags with a poly liner shut, as well as fold and glue the bag shut. Some machines just fold and glue the paper bag shut. There are also bag sealers that seal pre-glued bags with heat. Most products that use a glue bag sealer are 20 lbs or less. Consumer sized bags of flour and sugar are often packaged using a glue bag sealer.