Write-up on Amazon says "These marker brush pens can create beautiful watercolor effects by simply dabbing a plain brush into water, and on your page, thin out the ink.", which they do. Outer container is a fairly heavy envelope-like sleeve. Inner slotted tray is much lighter weight;...
If you prefer to keep your Ohuhus in the bag, you could orderthese plastic insertsthat contain individual slots - just be sure that the dimensions fit your Ohuhu bag. Alternatively, you could purchase a whole new bag on Amazon that comes with those types of inserts, or use a marker bag ...