This adapter can be used together with my Slurp'nPick+ station (https://youtu.be/mOqiC4d56NU) to remove the air from vacuum bags.

It can also be used to pick up big and heavy objects. It can also be used with any other small vacuum pump.

This probably only works when printed with a resin printer as it needs to be airtight.

A 20mm diameter, 2mm thick oring is required to create a good seal against the bag. A 20mm diameter piece of filter material is recommended to avoid debris from reaching the station.

(The following are affiliate links, this means I get a small commission if you purchase from them, it does not cost you anything extra)

Vacuum bags: https://s.click.aliexpress.com/e/_DkxLfyp or on amazon https://amzn.to/4wg0pS7 
20mm Metal filter mesh: https://s.click.aliexpress.com/e/_DFQJJwN or on amazon https://amzn.to/48HQ1Zy 
20mm/2mm Oring: https://s.click.aliexpress.com/e/_Dl7BU2D or on amazon https://amzn.to/4tqQMxF