While not the full CAD suite, the official app (iOS and Android) allows you to view, zoom, pan, and rotate 3D models. For showing a concept to a client in a coffee shop, this is often all the "portability" required.
A low-cost, cloud-connected version for hobbyists that allows installation on personal devices. Student Access: portable solidworks
There are a few options available for running a portable SolidWorks: While not the full CAD suite, the official