A simple adapter that goes from the attachment port of my Black and Decker handheld vacuum to the one-way valve port on those vacuum storage bags (commonly referred to by the popular brand name Space Bags). Brand to brand tends to basically be the same size port, but to account for some variance it's slightly oversize, but still makes a good seal on all the ones I've tried.
Eventually planning on printing one where the rim is printed in TPU so the vacuum plus the squish will make a better seal, but if you beat me to it please share your findings!
The author marked this model as their own original creation.