These velcro straps have eliminated my tarp sleeves, and made tarp life a whole lot simpler. I found them at Walmart, they are very durable, VELCRO brand. I use three on my cuben and spinn tarps. One in the middle and one on each end. I first roll up the tarp while its hung, strap these babies on, and then roll up the tarp from one end to the other. Each tarp will then fit perfect inside an orange Walmart dry sack.
Please excuse the webcam pics.
PS - The walmart Outdoor Products drys sacks are where its at for cheap sacks.