Pretzels are different thicknesses and sizes, so the volume amount may vary. You’ll want to use just enough to cover the bottom of the pan without leaving too many big holes. I used Snyder's of Hanover "Sourdough Specials" which are slightly puffier. If you use thinner pretzels, you might need up to 5 cups. For a smaller batch, use 2 1/2 cups pretzels, 1/2 cup brown sugar and 1/2 cup butter. Use a 9x13 inch pan to spread the pretzels in and bake for only about 5 minutes at 400.