I have been happy with the blue box Light Weight Q Tubes. They generally come out of the box with Hutchinson info printed on the tube. For the price they do fine and do not generally leak at the slow rate some SL tubes do. The best in general are the Schwalbe, but they cost twice as much. If this round of sealant in a tube foes well my next stem is a narrower SL Q Tube with sealant, the weight will be less than a Schwalbe and theoretically flat proof