F2s 128 GB Universal Flash Storage Class 10 Memory Card  (With Adapter)

If you are looking for something to sit flush with you Macbook Pro, move on, looks someplace else...
This does not sit flush with the system and juts out like an eyesore. From the earlier reviews I got the impression that this is a good way to increase the storage of the Macbook but it was so wrong. A regular SD card juts out, all this managed to do was reduce it by a mm or 3 not more. It might sit well with a bit older Macbooks but not the Late 2013-Mid 2015 models.
Better go for Transcend ...

Fit's all Macbook Pro/Air Models
Although notebook storage space can be expanded through an external hard drive, but this is means that the user must carry an additional hardware. Additionally, some people will take advantage of the side of the notebook SD Card slot, but many SD Card into the slot will reveal part of the outside. So this product will help you solve the problem.

Please mention the exact model of macbook this fits as the 15 and 13 inch models have different sized ports.Retina and non retina models also have different sized ports.