This is one time when images tell the tale. arc notebooks are both configurable and good with fountain pen ink. If Staples keeps the same supplier for paper in the future, this is one product that is well worth considering.
If you aren’t familiar with this sort of notebook system, suffice to say it is extremely flexible and yet very simple. The heavy weight paper moves easily into and out of the plastic discs. Position things any way you like. You can even purchase a special hole punch to add other items but flimsy paper might not hold up to the rigors of more than a few removals. For small items a glue stick would come in handy to attach bits to an arc sheet so nothing gets damaged or lost.
My arc notebook has an unadorned poly cover but it also comes in leather at a very reasonable price point. The paper is offered in narrow or graph ruled sheets as well as a project planner and a “to do” version. Just add a poly divider with pockets or tabs to keep things in their proper categories. Extra tools include page flags and task pads. Again, this is a simple system yet easily customized to your work flow and needs.
It took magnification to reveal feathering on the ruled sheets though only with one of the eight inks tested and at that only from the most free-flowing nib used. On the reverse there is no bleed-through and just the faintest hint of show-through. This is a paper destined for double-sided use and easily so considering the cover can be folded back to lay perfectly flat. Finally there is a notebook that fits both my limited space and my individual work style.
How can I use thee? Let me count the ways! No, I won’t bore you with my ideas but it should start you thinking about how you can use arc notebooks to increase your productivity and keep your fountain pens happy at the same time. Ready, set, go!