Warning, if you use all available apartments (in some cases with large pens for example) you can not close because of a too small strap kit (he should have added more pressure to a variable adjustment). Consider wrap quite "tight" early in order to enjoy a greater margin; I was able to cram all my sketches Conté crayons (which are quite large) plus other pencils (90% filling) and the farm just package.
In short, rather disappointed, the concept is still interesting. I use but I expected better.