Update: I've added 2 split versions. One with the larger holes & one with the regular slots. If you're printing them at 150% I suggest using the slots otherwise you have more of a dispenser than a shaker.
To fill it you'll probably want a funnel like this one: https://www.thingiverse.com/thing:3404829/files
I like to use kosher salt, restaurant style black pepper, & red pepper flakes. None of which would dispense from the original design so I loaded up 3D Builder and poked a hole in it!
This is just the internal part, need the rest of the parts from here: https://www.thingiverse.com/thing:492446
I printed mine at 150% size and it's perfect for my lunch box.
I printed my end caps at 144% with cheap TPU and it fits snugly