Instagram has added "bookmarks" and "saved posts" to the app's latest version both for iOS and Android platforms. These new features are part of the profile sections of the app which before now; wasn't available.
HOW IT WORKS
To place something in Saved Posts, you simply tap on the new bookmark icon that will show up underneath every single photo in your feed. The things you bookmark this way will be available to view later in Saved Posts. The Saved Posts tab in your Profile section is private, which means only you can see what you've kept around for later viewing.
HOW TO ENJOY THE NEW FEATURES
Once you update your Instagram app with the latest version 10.2 either via iTunes App Store for iOS and the Google Play Store for Android, you are good to go.