BLACK BAGS tells the story of two women whose fates are ostensibly intertwined by a switch-up of their luggage. There are many twists and turns in the story, so saying more would spoil the movie.
Although the switched luggage trope might seem like a meagre source for driving plots, the thrillers I know of which are based on it have turned out to be more or less good movies (or at least movies I liked), such as Roman Polanski's FRANTIC (1988), 8 HEADS IN A DUFFEL BAG (1997) and, though not a thriller but a classic nonetheless, WHAT's UP DOC (1972). BLACK BAGS joins this small group of good movies.
What impresses most in the movie is the acting by the two main characters, which is thoroughly believable and renders them real. Worse acting could have sunk this movie, since the story, though well-constructed, increasingly pulls on our suspension of disbelief. However, the quasi-philosophical questions about motherhood, and its relation to questions of good vs. Evil are raised in an organic way which make up for that, in my view
I also like that the movie deviates from the standard progression common in thrillers; the third act seems almost like a different kind of film, but nevertheless joins with what came before quite well, something which is not easy to pull off.
The direction, cinematography and editing were a little bland. I feel like there were opportunities for more tension and suspense which were missed. However, at no point was I bored and despite the criticism, these aspects of the move were definitely not bad.
The audience for this would consist of people who want to watch twisty indie thrillers with a greater-than-usual emphasis on fleshing out characters. Another such movie which is quite good, though not based on a switched luggage trope, is BULLITT COUNTY (2018).