Just received my SealVax starter kit with two large bags and two smaller bags. Already tested it on a block of frozen broth. Seems to work well. The bags are well made. Will see how durable.

SealVax bag with frozen broth in chest freezer

SealVax product box

SealVax vacuum seal bags, keychain pump, usb chord and liquid separation chamber

That little triangle shaped thing is the vacuum pump.