Modular cosmetic container assembly

A modular cosmetic container assembly, comprising:

• a base having a bottom wall and a plurality of sidewalls defining an insert receiving space, the plurality of sidewalls include a first sidewall and a second sidewall opposite the first sidewall, the insert receiving space is defined between the first sidewall and the second sidewall, each of the first sidewall and the second sidewall has a notch extending through the sidewall,
• a plurality of inserts removably insertable into the insert receiving space, each of the inserts is monolithically formed in a single piece and has a same plurality of outer dimensions and at least one well, the inserts differ in a number of the wells in each of the inserts, the insert receiving space is sized to receive at least two of the plurality of inserts that are all interchangeably positionable in the insert receiving space, each of the inserts has a tab extending from each of a pair of opposite exterior sides of the insert, one of the tabs is received in the notch extending through the first sidewall and another of the tabs is received in the notch extending through the second sidewall, the tabs are accessible from an exterior of the first sidewall and the second sidewall;
• and
• a lid attachable with the base with the inserts in the insert receiving space, the lid has a plurality of sidewalls that are friction-fit with the sidewalls of the base to form an air-tight seal around the insert receiving space.