google-material-design-icons/android/content/inbox/materialiconsround/black/res/drawable/round_inbox_24.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24"
    android:tint="?attr/colorControlNormal">
  <path
      android:fillColor="@android:color/white"
      android:pathData="M19,3H5C3.9,3 3,3.9 3,5v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2V5C21,3.9 20.1,3 19,3zM19,5v9h-3.56c-0.36,0 -0.68,0.19 -0.86,0.5C14.06,15.4 13.11,16 12,16s-2.06,-0.6 -2.58,-1.5C9.24,14.19 8.91,14 8.56,14H5V5H19z"/>
</vector>