Quad Anchors a.k.a. 2 Piece Anchors
Like most aspects of climbing, there are many ways to build a good quad anchor. 7mmX18' (~5.5m), 2 nonlockers and a HMS Strike Screw. Ya, it weighs a little more than a 10mmX180cm sling, but it sure is versatile.
You may need additional equipment. This is not a recommendation! I am sharing my opinions, which might be wrong. Remember, buying equipment does not equal knowing how to use it. These kits are NOT designed for industrial or professional rescue work.