For frequent traveler, they got all sort of kit. The kit for travel usually small and easy to carry when mobile. Among the objective is also to pass the immigration without so much hassle. For example, it is difficult to find an adult shower cream below 200ml except for babies. So with travel compliant carry-on Kit you can pour all your cream and lotion in the travel tube / bottle.
With the kit, you can save because the tube is reusable and make it easy to pass the immigration check.
3-1-1 Totally Compliant Carry-on Kit