diff --git a/cli50 b/cli50
index 24c0d0f..fddc08a 100755
--- a/cli50
+++ b/cli50
@@ -34,7 +34,8 @@ def main():
     parser = argparse.ArgumentParser()
     parser.add_argument("-f", "--fast", action="store_true", help="skip autoupdate")
     parser.add_argument("-g", "--git", action="store_true", help="mount .gitconfig")
-    parser.add_argument("-l", "--login", help="log into container", metavar="CONTAINER")
+    parser.add_argument("-l", "--login", const=True, default=False, help="log into container",
+                        metavar="CONTAINER", nargs="?")
     parser.add_argument("-p", "--publish", action="append",
                         help="publish port(s) to ports on host", metavar="LIST", nargs="?")
     parser.add_argument("-P", "--publish-all", action="store_true",
@@ -79,46 +80,52 @@ def main():
 
     # Log into container
     if args["login"]:
+
+        # If container specified
+        if isinstance(args["login"], str):
+            try:
+                login(args["login"])
+            except:
+                sys.exit(1)
+            else:
+                sys.exit(0)
+
+        # Check for running containers
         try:
-            login(args["login"])
-        except:
+            stdout = subprocess.check_output([
+                "docker", "ps",
+                "--all",
+                "--filter", "status=running",
+                "--format", "{{.ID}}\t{{.Image}}\t{{.RunningFor}}\t{{.Mounts}}",
+                "--no-trunc"
+            ]).decode("utf-8")
+        except subprocess.CalledProcessError:
             sys.exit(1)
         else:
-            sys.exit(0)
-
-    # Check for running containers
-    try:
-        stdout = subprocess.check_output([
-            "docker", "ps",
-            "--all",
-            "--filter",
-            f"volume={directory}",
-            "--format", "{{.ID}}\t{{.Image}}\t{{.RunningFor}}\t{{.Status}}"
-        ]).decode("utf-8")
-    except subprocess.CalledProcessError:
-        sys.exit(1)
-    else:
-        containers = []
-        for line in stdout.rstrip().splitlines():
-            ID, Image, RunningFor, Status = line.split("\t")
-            if Image == image and Status.startswith("Up"):
-                containers.append((ID, RunningFor.lower()))
-
-    # Ask whether to use a running container
-    if containers:
-        print(f"{directory} is already mounted in {len(containers)} {inflect.engine().plural('container', len(containers))}.")
-    for ID, RunningFor in containers:
-        while True:
-            stdin = input(f"New shell in {ID}, running for {RunningFor}? [Y] ")
-            if re.match("^\s*(?:y|yes)?\s*$", stdin, re.I):
-                try:
-                    login(ID)
-                except:
-                    sys.exit(1)
+            containers = []
+            for line in stdout.rstrip().splitlines():
+                ID, Image, RunningFor, *Mounts = line.split("\t")
+                Mounts = Mounts[0].split(",") if Mounts else []
+                Mounts = [Mount for Mount in Mounts if not re.match(r"^[0-9a-fA-F]{64}$", Mount)]  # Ignore hashes
+                containers.append((ID, Image, RunningFor.lower(), Mounts))
+
+        # Ask whether to use a running container
+        for ID, Image, RunningFor, Mounts in containers:
+            while True:
+                prompt = f"Log into {Image}, started {RunningFor}"
+                if Mounts:
+                    prompt += " with " + inflect.engine().join(Mounts) + " mounted"
+                prompt += "? [Y] "
+                stdin = input(prompt)
+                if re.match("^\s*(?:y|yes)?\s*$", stdin, re.I):
+                    try:
+                        login(ID)
+                    except:
+                        sys.exit(1)
+                    else:
+                        sys.exit(0)
                 else:
-                    sys.exit(0)
-            else:
-                break
+                    break
 
     # Update image
     if not args["fast"]:
diff --git a/setup.py b/setup.py
index c93ab38..e396e11 100644
--- a/setup.py
+++ b/setup.py
@@ -16,5 +16,5 @@
     python_requires=">=3.6",
     scripts=["cli50"],
     url="https://github.com/cs50/cli50",
-    version="2.2.1"
+    version="2.3.0"
 )