When comparing compact mini scuba tanks, check the manufacturer’s documentation for: Intended use and depth limits Cylinder capacity and rated pressure Compatible refill methods Inspection and maintenance requirements I’m with XPGEEKS, an authorized SMACODIVE distributor. For reference, here is the SMACODIVE S300 Plus product page:https://xpgeeks.com/product.htmlid=s300plus-mini-scuba-tank Disclosure: This is a commercial link. A mini tank is not a replacement for a standard scuba setup or proper training.