As Linda says there is plenty of room under the bus for your bags, and the ride up and down is one of the highlights of visiting Castelrotto
There are two options for catching the bus in Bolzano :
1. When exiting the station head across the street bearing left at about 45 degrees and go through the park till you see the bus station on your left
2. Exit the station, don’t cross the road, turn right and walk about 150 metres to the bus stop, it’s well sign posted.
If you go for option two, you will need to open the lockers under the bus yourself to load your bags.
On the return trip the bus stops directly across from the station.
This the link to the bus timetables – you need route 170 http://www.sii.bz.it/en/siipdfOldtimetables