The case really inspires confidence as rigid, with 2 zippers (handy if one should break).
My Seagate Slim (in cm 7.6 x 11.4 x 1.2) goes smoothly, and I would suggest, on the 1 / 2cm remaining at each end, stalling paper or foam to absorb further possible drop
As noted by the previous reviewer, we can superimpose 2 DDE smoothly, given the depth of the inner housing (3.5cm).
Finally, for owners of other models: my other DDE (7.8 x 12.2 x 1.5) returns again but wider or longer it will not fit.
Please note ... these are the dimensions of the inner rectangle TRUE: 7.8 x 12.2 x 13.5 and not 8.5 (under "Product Description"), which represents the possible maximum dimensions for a rectangular to DDE rounded corners! But if your DDE is really rectangular, it should not exceed 7.8 x 13.5 x 12.2 or 8.5.