So I have been doing a lot of searching and decided that I like the design and style of the William Joseph vests and backpacks the best. I have not had a chance to try any of these items on so I was wondering if any of you guys use them. The items I'm looking at are the Exodus, Escape, and the Fusion. I'm wondering if the Exodus can actually come apart like a two piece system with a backpack and then a vest? If not then I think I might get the Escape and Fusion. Has anyone used any of these packs that can offer their opinions? Thanks.