I like the fact that the main content on the page never disappears, although the interacting with the side bar is at an all time high. It's a very clean layout with flat ui colors that speaks nicely to the flow of the app.
Material UI Kit https://ui8.net/product/material-ui-kit
Ticket App #UI
Emka Fashion by Dmitry Zyuzin, via Behance #fashion #ecommerce #mobile