I'm showing the Spatha and Testudo together as they are very similar in core layout with the Testudo being slightly larger and having optional backpack functionality.
This makes the Testudo a hybrid pack where it can be in shoulder strap mode for quick access or switched over to backpack mode for much more comfort and mobility in longer hauls.
Maxpedition offers alternate shoulder straps with snap hooks for purchase which offers more options, but the alternate shoulder strap should just be the one that comes with the Testudo to begin with.
马盖先提供了带旋转挂钩的替代肩带以供购买，但这根转换肩带应该是一开始就只适合与龟甲包一起使用的。
词源
1
testudo:
From Latin testūdō ?(“tortoise, turtle, lyre, type of military shelter”).