In most Canadian cities, Tetra Pak cartons go in your blue bin. Check the helpful link below to find out if Flow is recyclable in your area.
If you’re ever unsure, the easiest move is to check your municipality’s recycling guide - because “wishcycling” (throwing it in and hoping for the best) is fun in theory, less fun in practice.
Bottom line: if it held Flow, it’s likely got a second life waiting for it.