I am using the stasher bags for sous vide and came up with the simple way to vacuum seal the bags.
It is similar to the chamber vacuum sealer method but I am using the plastic reusable vacuum bag as the external chamber.
I place the unsealed stasher bag with the product inside the plastic reusable vacuum bag then I seal the external bag by using the manual pump which comes with it.
This removes the air from both external and internal bags. The second step is to seal the inside stasher bag by pressing on the seal area while the external bag is still sealed. After this you can open the external bag and take out the stasher bag which is perfectly vacuum sealed.
This is a very efficient, simple and quick technique.