Spoon about ¼ cup berry mixture over wafers. Scoop 1½ cups whipped cream into a small bowl; cover and save in fridge for later. Spread ½ cup of the remaining whipped cream evenly over wafer and berry layers. Repeat layers with wafers (breaking to fit as needed—no one will know), blackberry mixture, and whipped cream, using more for each layer as the bowl gets wider, until you run out of all the components.
https://www.bonappetit.com/recipe/blackberry-icebox-cake