Might as well share my choices too, because they don't perfectly align with what others are sharing.
For the standard little "1ml" (Ajevie slink) vials I go with 38/357 sizing. Make sure you pick one with a mechanical hinge if you go with a flip-top, the crease hinges break REAL fast. These MTMs are my go-to since they tend to be cheap and I can color-code keep vs swap. I also have a slip-top box in the same size for taller vials since there's no height limit that way, but obviously it's less secure.
For "5ml" rollers and drams, I go with a 12/16 gauge shell box (I have the red one, 2.75"). The one I'm using has a side space without dividers that you can use to lay down bottles if you trust the seal, or for keeping dropper-top D&F samples.
For short 1ml bottles (Ajevie slonks) I use crayon boxes I picked up at Michael's for like a buck each. They look like this but DON'T buy them from Amazon, seriously just go to your local craft or office supplies shop to find them at a reasonable price. They don't have dividers so they slide around, but generally the clearance is low enough to keep them from tipping over.
I can't include every vendor's name, there are just too many so hopefully that sizing photo will help you. I haven't included Sixteen92's 2ml sample in a case because I just put mine in the side of the Plano 12 or 16 Gauge box.
BPAL's imps are also 1ml. BPAL full size fits, tight into a 10-12 gauge ammo case.
For 1ml vials (BPAL Imps, Solstice Scent samples, etc) THIS case works perfect. (Search Amazon: MTM 38/357 Cal 100 Round Flip-Top Ammo Box)
For full size bottles (BPAL, Madame Josephine Rollerballs, Solstice Scents full size roller balls) THIS case works. (Search Amazon: MTM 25-Round Magnum Shotshell Box)
For Cocoa Pink drams, Smelly Yeti samples, Alchimia Apothecary samples, ThreeTenLabs samples, etc. THIS case works (Search Amazon: Plano Shot Shell Box, 12 & 16 gauge)
I hope this helps! :)