The term pijpzak refers to a type of two-droned Flemish bagpipe, as portrayed in the artwork of Pieter Bruegel the Elder and many others.
The two drone pipes, which have single reeds and are typically a fifth apart, are in the same stock and face directly up or slightly forward, depending on the individual position of the piper.
The pijpzak is at first sight similar in design to the cornemuse du Centre of Central France.
The Belgian pipe maker Wout Vanloffeld compared the available data to Breugel's very accurate pictures and to the equally precise descriptions Michael Praetorius gave in his Syntagma Musicum.
He made reconstructions and models and created an adapted reed, also taking in account the suggestions Praetorius had given, such as the addition of a left thumb hole.