I do this, we’ll on a specific little hooked branch of a tree.
but genuinely pick it up on the way back, reason being I go a loop with my dog and there is zero bins on that loop, so pop on my wee hook branch, finish the walk and get it on way back so I’m only carrying it for a wee bit and not a hour. If he does a shit at any point in the walk after this wee hook then I just need to carry it back.