When my daughter began to use markers and crayons, we ran into a problem: If the container holding them is taller-than-it-is-wide, it will tip. Wider-than-it-is-tall won't tip, but you can't see what you have; it is a big pile in a box. SO: the perfect solution is lots of tall things, glued together into something wide.
Step 1: Lining up to rolls.
Glue them together standing up, so that the bottoms are flat on a flat surface.
Then, lay the whole row on its side so that it dries flat and straight.
Allow the glue to dry overnight.