The Pressure Packager processes items (and some blocks) into their compressed forms, coal to coal block, hay to hay block, snow balls to snow, snow to ice, ice to packed ice, etc. Any vanilla item that has a 2x2 or 3x3 and results in a block is registered as a pressure packing recipe. Additionally a few others, such as snow to ice and ice to packed ice, are supplied.
The primary purpose of this block was to compact the ore chunks provided by Harder Ores into a block that Rotary Craft's Extractor could process in the expected manner.
The Pressure Packager requires power from a windmill, like the millstone, to operate. Its speed depends on the resulting block's hardness, the harder the block, the longer the Pressure Packager takes to compress the items.