This paper presents experiments to support development of mesomechanics models for prediction of the strength of Non-Crimp Fabric (NCF) materials under tri-axial loading. Here we describe initial tests to characterise the failure envelope of the material in fibre bundles of a carbon fibre/epoxy NCF. Uniaxial loading of unidirectional off-axis specimens is used to obtain in-plane stress states ranging from highly shear dominated to fully transverse or axial tension, while future tests will include compressive stresses. The bundle material is represented by filament winding of unidirectional laminates and subsequent vacuum infusion of the resin. The resulting fibre volume fraction of 69% is representative of typical bundles in NCF materials. A modified Puck failure criterion provides reasonable predictions of the failure envelope.