I own an (old-ish) Rema TT 06 patch kit. The contents look like this:
Notice the blue tube-like thing under the left box. In the part list on the manufacturer's site, I couldn't find any mention of that thing (http://www.rematiptop.com/part.php?pid=56&cid=5&sid=4, which is also the source of the image).
Is is basically a short tube of mesh-like, flexible material. What is it used for?