The 0340 cube case is a new product from Peli it is versatile and great value Its internal dimensions are 457mm x 457mm x 445mm that's approximately 18 inches.

See all case sizes link here

They come with a cube mobility kit which adds wheels to the package. They are of course made to the same exacting standards and this size completes the range of cube cases. It can also be transported by two extra wide handles on each side. It includes a recessed, built-in, rigid pull handle, secured by a spring loaded release latch that will stay folded down when not needed.
Outside Dimensions
(without wheels) 51.8 x 51.8 x 48.9cm
OUTSIDE (with wheels)
53 x 51.8 x 48.9cm
INSIDE 45.5 x 45.5 x 44.6 cm
INTERNAL BOTTOM 43 x 43 x 31.5cm
Lid depth 9cm
Colours Black

Available Options:
F&D: