三角巾，正式名为三角绷带，是急救包中重要包扎用品。其形状是一等腰直角三角形，短边边长一米余，部分以扣布制成。

• 减少出血
• 固定敷料及夹板
• 固定及承托受伤部位

Esmarch bandage (also known as Esmarch's bandage for surgical haemostasis or Esmarch's tourniquet) in its modern form is a narrow (5 to 10 cm wide) soft rubber bandage that is used to expel venous blood from a limb (exsanguinate) that has had its arterial supply cut off by a tourniquet. The limb is often elevated as the elastic pressure is applied.The exsanguination is necessary to enable some types of delicate reconstructive surgery where bleeding would obscure the working area. A bloodless area is also required to introduce local anaesthetic agents for a regional nerve block. This method was first described by Augustus Bier in 1908.(