A baler apparatus includes a baling chamber including at least one adjustable wall for adjusting compression of a body of bale material. A reciprocating plunger is operable to compress the bale material and a binding device binds the compressed material to form a bale by use of twine loops. An adjustment mechanism increases as a length of outer twine loops when binding the bale relative to the inner twine loops, to reduce compression within part of the body of bale material and avoid twine breakage that can otherwise occur as a bale is ejected from the baler.