This funnel is made with a special flexibility that allows it to stretch over the mouth of an opened can, while the small end accepts the spout of a pouch. The varnish will begin to flow on its own, but you can use a gentle up-and-down bellows action to complete the transfer more quickly.
The 8 StopLoss Storage Bags for Wood Stains, Finishes, Varnish & Solvents would be an ideal fit for professional or hobbyist woodworkers who frequently work with wood stains, finishes, and solvents.