Think in terms of design logic for practical functioning, as well as, durability of the material used, hinges, screws, handles, etc   

If you do plan to travel with this type of case, you definitely want to ensure durability.  If this case is for home organization, perhaps you can afford to give up a little on the 'ultimate in durability' department. If you are a professional artist, you want the ultimate in organization, space efficient design and portability.

One great way of shopping for a product is to be able to compare your options on details like quality of materials, size and price points.  Surfing on line is great way of learning about what you would like to buy.

Here are a few great options I discovered when doing a little 'homework' online,  looking for cosmetic train cases:

Size: 13 x 9 x 8.5 inches

"Case includes four fold out trays with adjustable dividers, a deep center compartment with adjustable dividers, two safety closures, and a detachable shoulder strap."
 

Size: 13.75 x 8.5 x 9.25 inches

"Sephora Metro Train Case goes uber-chic, with a gleaming gunmetal metallic finish. It sports snap locks, plus a lock and key to keep your items secure, fully adjustable inner trays, a four-tier fold out tray, plus a detachable shoulder strap."

"The ULTIMATE professional makeup case kit. This is our #1 top seller. It has compartments and trays that are convenient and endless. It has trays that you can pull up and out of the base to hold brushes or pencils. A deep bottom big enough to hold your bottles and palettes. In line skate wheels for easy mobility. This case is a must have for the professional makeup artist.

• 2 Cases in 1

• High Quality Aluminum Finish.

• Reinforced Steel Corners for Extra Durability.

• Telescopic Handle with In-Line Skate Wheels."

For more about this cosmetic train case or more of this company's collection, click here.