This mod is an addon to Deadlock's Stacking Beltboxes and Loaders, the original mod is required. I added a value in mod settings (default 100) that will be used as stacksize for all stacked items.
https://mods.factorio.com/mod/deadlock-beltboxes-loaders

Normally the beltboxes make the stacksizes scale dynamically with stacksize of the normal item. That ensured game balance, but didn't let you store any more items be it stacked or non stacked. For example If you had set item stack consist of 10 items, then stack of iron plates were made into 10 stacks of compressed items. It's just my opinion that by doing so it reduced much of the value of packing items in the first place. Embrace the way of the hoarder!

In other words, i wasn't happy with how limited my SimpleCompress mod is. Without reinventing the wheel and combining ideas of SimpleCompress+Stacking Beltboxes you get this mod. A much wider variety of items you can compress while also being able to store them in larger amounts.

Shanemadden made another mod "Deadlock Experimental Stacking" that is supposed to add the stacksize configuration, but it is a much more complex and less maintainable mod overall. This mod supports all mods without requiring to write any mod-specific code.
https://mods.factorio.com/mod/deadlock-experiments

Mod reposted with zz_ -prefix in hopes that data-final-fixes will be loaded after other DLstacking addon mods.