Black North Face backpack with blue keychain

I lost my black North Face backpack yesterday around 3pm near the Grand Arcade on Market Street in Cambridge. It's a medium-sized backpack, black with a red zipper pull and a small blue coffee-cup keychain on the zipper of the main pocket. Inside there's a university laptop sleeve, a notebook with a purple cover, and a faded photo of my grandma tucked in the front pocket. It has sentimental value — I really need it back, since all my class notes are in there and I was counting on it for finals. If anyone found it, please message me; I’d be incredibly grateful to get it back.