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However, as Taiman below mentions, and I have observed with several other high capacity Type-C banks of my own, it will probably trickle charge a MacBook Pro, even while you are using it. But all that means is you'll be able to use it for longer and your internal battery drains just a little bit slower than normal. If you start out at 100%, and hook this up to it, you'll probably get an additional 2-2 1/2 hours of use out of the Mac until it shuts down (even if the power bank still has some charge left). But if you are already low on power when you attach this to your Mac, you will get very little benefit trying to use it with this setup.
Now if you are at 0% and don't need to use your Mac right away, plugging this in while the Mac sleeps or is shut down will recharge the internal battery, albeit very slowly. But it's better than nothing, especially when you are traveling and away from outlet power.
Otherwise, if you need 30W of recharging power while you use your computer, then look for banks that feature "Power Delivery". Currently Anker, Aukey, RAVPower, and others have this feature.
The RavPower, though, has been between $55 to $65 several times. And being PD is absolutely worth waiting for, or spending an extra $10 on. Actually you can get the Rav right now from B&H for only $10 more: goo.gl/bNYN63
You do miss out on an included charging wall unit with the RAV, but (and I guess I can only speak for myself) I have so many of them already, I'd rather see it not included (in both products) and the cost brought down.
Personally, the PD aspect is that important, and I'd buy another of the RAVs, even for $10 more than this, than a non-PD bank of this size. Or just wait til it's $56 again if there's no rush.
That said, and not as criticism of the NazTech product here, but, if you do require “Power Delivery” to charge a Type-C device like a Nintendo Switch or a MacBook Pro, Aukey has a coupon for 27% Off on their PB-Y7 which is 30,000 mAh and features “PD”. Look for the coupon link BELOW the normal price of $79.99. Click it and Redeem then add the item to your Cart. You won’t see the discount yet in your Cart but you will see it on the next screen after proceeding to “Checkout”. Before confirming the purchase you should see a $21.00 Discount in the summery making the cost about $59 instead of $80. Mine arrived yesterday.