Liquids.
Use refillable bottles for compatible liquid personal-care products.
For routines that need more than a few liquid bottles.

A larger toiletry kit makes sense when the routine extends beyond liquid bottles. Creams, sprays and filling tools benefit from having their own formats instead of being improvised into whatever container is available.
The DEPOZA approach is to keep those pieces together and visible, so a broader routine still feels composed rather than crowded.
Use refillable bottles for compatible liquid personal-care products.
Give thicker and sprayable formulas their own container types.
Keep small filling and cleaning accessories with the kit so the setup is easier to reset.