Slivers are slices of the viewport’s contents. When you have multiple kinds of layouts in a scroll view this is what you have to use.

There are a lot of built-in Slivers, but no built-in staggered one, so I created it. You can find the code here: https://github.com/letsar/flutter_staggered_grid_view/blob/master/lib/src/sliver.dart and you can use it in a CustomScrollView as demonstrated here: https://www.dartdocs.org/documentation/flutter/0.0.33/widgets/CustomScrollView-class.html.