The source widepac divide 2l hydration system carry two drinks in one hydration system the widepac dvide features two separate compartments flexible in size and you have both drinks available at all times the dvide system fits all source packs except the packs with outside access to the bladder source widepac divide 2l hydration system features triple layer taste and odor free pe film with anti microbial agent co extruded tube pp pe amp pom injected plast