Fly tying trash bags are a life saver, but magnetic ones are even better.  Once you start using a magnetic trash bag you will wonder how you ever got by without one.  The base attaches to the shaft of your vise and the bag can be removed from the base and snapped back on at any time making the process of emptying the bag extremely simple.  I have never encountered a vise that this won't fit, but I'm sure they exist so please review the dimensions before you buy.  The hole used to attach the base to the vise is just under 7/11 inch (11mm) in size.  Each bag is assembled by hand so there are slight variations in size, but these are minimal, the diameter of the bag is generally between 6.75 inches and 7 inches.  the height of each bag is around 1.5 inches.