A device to be inserted into a conduit includes at least one tube intended to receive optic fibers or micro fiber optic cables therein. A jacket surrounds the tube. In an embodiment where there are aplurality of tubes, they are loosely aligned within the jacket. In another embodiment, opposed surfaces of the jacket are attached to each other to form compartments for each tube. In still another embodiment, the jacket holds the tubes generally in a bundle. The jacket of a tube may also be attached to one or more innerducts, each of which can receive a fiber optic cable. Alternatively, an innerduct may be attached to two jackets each of which carry a tube therein.