Scene Transition
When moving between scenes there are a few solutions to keep your player data.
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You can place a "DontDestroyOnLoad" component to the _Managers object, the Player and the Canvas. This will prevent the objects from being destroyed between scene loads and will keep all your player and inventory data.
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Another option would be to create a 2nd scene that contains your player data (_Manager, Player and Canvas), and never unload this scene. As of Unity 5.4 it's possible to load multiple scenes at once, so you can utilise 1 for all the player data.
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And the last option would be to save all data, destroy it, load the next scene and load all data back into memory. Although this is an option I personally don't prefer to use it, as you're just re-creating everything you just threw away a second ago. More about saving and loading.
Generally, option 1 or option 2 are recommended, as they're the fastest, safest, and generally easiest to implement.