I have over 20 multi-tray cases of these: https://www.krmulticase.com/ and I love them for 15 to 28 mm figures. The 6 mm cases are okay but some larger 6 mm figures push the soft inner parts in some ways.
Edit from
https://www.krmulticase.com/resources/traysizes.aspx KR Tray Sizes
tray external dimensions
There are TWO sizes of KR trays, the standard tray at 380mm x 255mm, and the half tray at 190mm x 255mm.
tray depths
All KR foam trays are available in 6 compartment depths: 10mm, 23mm, 32mm, 51mm, 70mm and 110mm.
compartment sizes
All of our foam trays are available in 6 compartment depths: 10mm, 23mm, 32mm, 51mm, 70mm and 110mm.
The F-format trays have the largest compartment size for figure storage of any comparable system, at 53mm x 30mm (LxW)
The N-format are comparable to many on the market at 50mm x 25mm (LxW)
The M-format are ideal for 20-28mm figures at 40mm x 25mm (LxW)
The card trays are 53mm x 30mm x 35mm (LxWxD)
To demonstrate the compartment size the pics on the left show a standard 28mm pirate figure in the F-format and the N-format trays. Many thanks to Black Cat Bases for the Pirate!
KR core tray formats
There are SEVEN formats of core trays as listed here:
F-format (36 compartments)
N-format (40 compartments)
M-format (50 compartments)
0-format (49 compartments)
V-format segmented pick&pluck (6 rows, 30mm wide with 10mm walls)
D-format segmented pick&pluck (5 rows, 40mm wide with 10mm walls)
J-format segmented pick&pluck (4 rows, 50mm wide with 10mm walls)
Printouts are available of the core trays from the tray printouts page.
Gracias,
Glenn