Punch-bag is an NPC that appeared in every Evolution of Combat BTS video for testing abilities and other new features involved in the Evolution of Combat, but did not actually feature on the Evolution of Combat beta servers.
Depending on which video he appeared in, the Punch-bag was either combat level 2 or 139. He was seen wearing slayer helmet, Bandos chesplate, Bandos tassets, Bandos boots, Defence cape, and a Chaotic rapier. The first few videos showed him in the outdated versions of full Bandos armour, Slayer helm, and a dragon defender; the dragon defender was equipped in its main hand. In the third BTS, its life points were estimated at around 10,000. The Punch-bag seems to have low attack and strength, as he would fight back, but could never actually deal damage in the videos.