For this Lacerta T29557, you do not need a separate sealing machine or heat sealer. It is a tamper-evident hinged container with an integrated closure. Lacerta specifically states that its Fresh N’ Sealed tamper-evident containers use integrated tamper-evident closures and do not require shrink bands, film seals, or additional packaging components. So, to seal it, you simply fill the three compartments, close the hinged lid, and press it closed until the tamper-evident closure engages. No special equipment should be required.