The WT4 is SICK Optic Electronic's (Eden Prairie, MN) smallest photoelectronic proximity sensor. It measures about 1 sq" and weighs 20 g. The WT4 has a variable scanning distance of 20 to 80 mm (0.788" to 3.152") to allow sensing of any color object against any reflective background.
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The Efficia 400 from Unitrak (Port Hope, Ontario, Canada) is an automated system that delivers bagged liquids or dry goods from f/f/s machines, counts and layers the bags as they're deposited into a set-up case and then discharges the case onto a central delivery conveyor leading to the case sealer.
General Packaging Equipment's (Houston, TX) line of automatic liquid vertical form/fill/seal machines can now produce bags with screw caps. Bags must be made of a heat-sealable material, and can be as large as 14" x 22".