My daughter suggested this as a review: "Tandem coffee doesn't just sell treats, it also sells (tote) bags".
I will add that the espresso-based drinks are excellent and consistent (Michee, one of the most experienced baristas in Toronto, makes all the drinks) and the setting is perfect: friendly service and a relaxed, peaceful room.
I also like that it is more of a "social" coffee house for reading and meeting friends than having an "office" environment (although I have seen some people working there).
Also, really cool tote bags.
One of my favourite places for coffee in Toronto.