A flexible innerduct structure having a first edge, a second edge, a first margin region, a second margin region, and a middle region. The middle region is located between the first and second margin regions. The innerduct structure comprises at least two flexible longitudinal tubes, each longitudinal tube forming two chambers. Each chamber is designed for enveloping at least one cable, where at least one of the longitudinal tubes extends from the first margin region to the second margin region, and wherein the tubes are attached together at an attachment in the middle region.