The Surface Book standard SD memory card slot is a great feature. My SLR & Compact cameras both use them but my phone, bike, and car cameras use Micro-SD. It is easy enough to use an adaptor for them but it sticks out so bagging, travelling, with it in is risky.
I noticed PB Tech stocked the “BaseQi Aluminium Micro SD Adapter” which takes a Micro-SD. It fits flush, with a recess to enable easy extraction, so I can leave the adaptor in the slot. It’s a convenient way to always have an adaptor available but in future, should I need more storage, it will be handy as an extension drive.