Thank you for the information.
I also emailed touristinfo@stockholm.se to see what they would recommend. They indicated that there are luggage lockers at the central station and at the bus station and provided the following links:
https://www.jernhusen.se/hitta-din-station/stockholm-centralstation/forvaringsboxar/
https://www.jernhusen.se/hitta-din-station/cityterminalen-stockholm/forvaringsboxar/
Per Google Translate, storage prices at the Cityterminalen are as follows...
Small: W36 x D57 x H44 cm. Storage in them costs SEK 39 per hour. Max SEK 199 per day.
Between: W46 x D82 x H66 cm. Storage in them costs SEK 69 per hour. Max SEK 299 per day.
Large: W29 x D56 x H185 cm. Storage in them costs SEK 69 per hour. Max SEK 299 per day.
The prices at the Centralstationen are similar.
We have opted to take Desdichado62's suggestion. We contacted the hotel, and they will store our baggage in advance of check-in without any charge.
Thanks again.