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JimVacMouse is an adapter that allows the air to be drawn out of UMAi Dry bag by a channel type vacuum sealer i.e Foodsaver.
Foodsaver bags have an embossed pattern in them to allow air to be evacuated, however UMAi Dry bags don’t have this feature and are flat, thus requiring an adapter. The Foodsaver you used model 4980 is not recommended for UMAi Dry process because it is fully automatic and designed for more rigid Foodsaver bag material. The best units are ones that have a lid and a latch. As explained in this illustration: http://www.drybagsteak.com/dry-age-cure-vacuum-sealer-comparison.php
Here is an old video of UMAi Dry application that explains VacMouse (sorry for the quality):