A dual modality container for transporting either frac sand and proppant or frac liquids for temporary storage and delivery to a well site for fracking operations. In a first modality, a plurality of inlet ports disposed atop the container roof receives frac sand from a frac sand supply source into a funnel-hopper. In a second modality, frac liquid is received at the well site and stored in bilateral bladders within a central chamber. An in situ elongated longitudinal linear valve disposed within the hopper effectuates industry standard pressurized discharge of stored frac sand or discharge of frac liquid.