Instagram has announced that starting this week you can save posts into private collections.
Tap and hold the bookmark icon underneath any post to save it directly to a collection. You can create and name a new collection when you save a post, or you can add it to one you’ve already created. You can also create a collection out of your existing saved posts. Tap the plus icon in the top right corner, give your collection a name and select the saved posts you’d like to add.
Your collections can be found on the saved posts tab on your profile.