A new feature in Instagram, Collections, lets users organize their saved pictures. Like with your regular individual saved photos, all of the collections are private. The feature is somewhat similar to how items can be organized in Pinterest.
Instagram first introduced post saves in December. Although it doesn't appear to be one of the app's top features, those who have been saving content may like the organization option provided by Collections.
It's not currently possible to share any of the custom collections you create in the app.
The feature is reaching Android and iOS.