Can you fit a mac book air 13.3 in a neoprene sleeve in the bag

I'd like to put a sleeve on the mac book air 13.3 what to find out can I fit that in the bag and how protective is the bag at side and base? Can you lock the zips?

Thule Crossover 21 Liter Backpack

Thule Crossover 21 Liter Backpack

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