Now that your material is cut, fold it like an accordion so that it unwraps quickly and easily.
Next, we make the bag for vacuuming. This requires special materials - mainly the bag material and the vacuum tape used to make the bag from pieces. Making a bag requires that your surface is clean (to prevent puncture) and you must not walk, kneel or put excessive pressure on your bag as this can cause punctures.
As for making the bag - that deserves it's own instructable. I may not have enough to document it by itself - so it's a good idea to have a mentor to show your the ropes :D