I love this backpack. It's highly adjustable and will hold my growing arsenal of pens. I prefer long thin double ends. This is ideal for long markers. You can leave the markers flat when storing the backpack upright or carrying it on the go. It then becomes a marker block when you place it on your back. My main markers are Kuretake [Kurecolor Fine and Brush]. They are long enough not to fall back into the body. I think double tombow tips would work even better as one end is tapered compared to the bulkier Kurecolors design. They will likely place more markers. I also have some Faber-Castell Pitt brushes and some cheap permanent markers. They do not or hardly go beyond the Velcro fasteners, but can still be pulled out easily. With these shorter markers, it's easy to stop them from moving with small sketches or other accessories. It's also easy to store more pens/supplies due to the case's two pockets and the space that can be left on top. I used an insert from another bag. Mine arrived with plastic side supports that are curved and won't flatten out. I can feel it through the fabric. This was not a problem as the pocket is supported by internal walls and its fullness depends on the number of pens stored.
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