An expensive small 1x1 chest that can hold a near infinite amount of items (65530 slots=33mil iron ores=65 mil iron plates=131mil steel plates). Good for being used as a buffer for ores. If you want a big 6x6 version (~1800 slot storage), look up the warehouse mod
A very expensive 1x1 fluid storage tank that can hold an unlimited amount of fluid. ***VERY IMPORTANT*** You MUST put a pump to output fluid, otherwise no fluid will come out. The tank costs as much as 100 regular fluid storage tanks (2000 iron plates and 500 steel plates) OR you can make it directly using 100 fluid tanks. Either way, it takes a LONG time to craft.
Small little portable nuclear reactor (3x3), good for the first power armor, useful on scenarios with no sun for solar panels