The internal protection foam is not adapted automatically to the model Lacie Rikiki 2.5 as shown in the photo, it is pre-cut into small squares 7 mm side, you complete the cut so they fit in better the model you want to protect.
The outer part, presented as rubber is sturdy, it is a good point.
The problem because there is one, is located at the closing of the case, it is not reliable at all.
Indeed, the rigidity of the outer casing of the housing in this location does not allow perfectly secure closure. Clearly, if the box escapes you hands, there is a good chance that it opens and it no longer fulfills its protective role.
Solution, a large elastic to ensure that the housing will remain closed at all times.
Finally, it should be noted that this case is of significant size (width: 120mm, thickness: 40mm, length: 190 mm).
In summary, this case is robust but has a big weakness in its closure. Given its size, it may be emcombrant for some.
If you have an external hard drive LaCie Rikiki, I would recommend carrying case LaCie - Cozy - Case for External Hard Disk 2,5 "- Black probably better suited to this.