The phrase "endless stacks" means a large number or amount of something that seems to go on forever, without ever running out or coming to an end. Full definition
If you have ever had to search through endless stacks of business papers to find the one document that you need, you know the value of being organized. (smallbusiness.chron.com)
Whether a timeless diamond design or fashion - forward statement is preferred, our cocktail rings and fine band collections present endless stacking combinations at your fingertips. (astleyclarke.com)
Rifling through a seemingly endless stack of resumes and applications can be tedious, especially if you aren't quite sure what you're looking for. (elearningindustry.com)