Midwest - Luggage storage in Minneapolis

I will have an appr. 8 hour stopover in Minneapolis in early March. Arriving at MSP in the early morning, and departing by bus late in the afternoon.

Are there any luggage lockers or left-luggage services landside at MSP or anywhere downtown ( Greyhound station, Transit Centre, Amtrak, etc.) ?

It looks like I won't have any trouble finding interesting things to do, I just don't feel like schlepping my backpack around with me for the whole day.

Thanks in advance.

MSP has luggage lockers inside of security. Some are located by the low numbered gates in Concourse C. There used to be some in F Concourse also, but not sure if they are still there.