Threema-Android-mirror/app/src/main/res/drawable/ic_collections.xml

<!-- drawable/image_filter.xml -->
<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:height="24dp"
    android:width="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24">
    <path android:fillColor="#000" android:pathData="M21,17H7V3H21M21,1H7A2,2 0 0,0 5,3V17A2,2 0 0,0 7,19H21A2,2 0 0,0 23,17V3A2,2 0 0,0 21,1M3,5H1V21A2,2 0 0,0 3,23H19V21H3M15.96,10.29L13.21,13.83L11.25,11.47L8.5,15H19.5L15.96,10.29Z" />
</vector>