A Reynolds Handi-Vac (a phaser-looking hand held vacuum for their proprietary valved zipper bags) draws a surprising vacuum --- down to a few tenths of a psi end pressure. That's as good as perfect for suction applications. I don't know what they cost now (or if they've downrated its performance), but I grabbed a bunch at $8 when they first came out, just a few years ago.



I cut the tip off its small side-ported plastic outlet to make it end-ported, slip some polyethylene tubing over that, leading into a hole (and suitable fitting) in the lid of glass jar (to act as a "vacuum capacitor" for smoother output), with a second fitting in the jar lid as my vacuum "output". The set-up has proven itself quite versatile over the years.



The great thing about vacuum is that (unlike pneumatic/hydraulic pressure), it's self-limiting. You rarely have to worry about your fittings/vessels unless you need HIGH vacuum. Any food product jar normally sits indefinitely at (perfect vacuum + vapor pressure of water) so the few extra Pa of even a perfect vacuum wouldn't stress it appreciably.



No other food-sealer vac I've tried, whether wall- or battery-powered, has come close to The Reynolds' terminal vacuum, though wall powered units have higher throughput, which can be a big benefit if you don't need every last PSI, because (as I configure it) you have to suck all the air out of the jar ("charge the vacuum capacitor") at the start of each session (use a small jar!)