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A bullet journal pen has a much tougher job than a casual desk pen. It needs to make compact writing legible, distinguish headers from task lines, behave well on thin notebook paper, and still feel good after a whole weekly spread. MUJI’s current pen range is unusually useful here because it spans ultra-fine gel, everyday gel, bolder gel, oil ink, multi-pens, and a compact fountain pen rather than simply repeating the same pen in different colors. These ten choices separate those roles so you can build a small, purposeful pen case instead of buying ten near-identical bodies.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | MUJI Gel Ink Ballpoint Cap Type Pen 0.38 mm | $1.90–$2.40 | Amazon · eBay |
| 2 | MUJI Gel Ink Ballpoint Cap Type Pen 0.5 mm | $2–$3 | Amazon · eBay |
| 3 | MUJI Gel Ink Ballpoint Cap Type Pen 0.7 mm | $2–$3 | Amazon |
| 4 | MUJI Gel Ink Ballpoint Pen Knock Type 0.5 mm | $2–$3 | Amazon · eBay |
| 5 | MUJI Smooth Gel Ink Ballpoint Pen 0.5 mm | $2–$3 | Amazon · eBay |
| 6 | MUJI Smooth Gel Ink Ballpoint Knock Pen 0.3 mm | $2–$3 | Amazon · eBay |
| 7 | MUJI Smooth Oil Ink Ballpoint Pen 0.7 mm | $2–$3 | Amazon · eBay |
| 8 | MUJI Smooth Oil Ink 4-Color Ballpoint Pen 0.7 mm | $5–$7 | Amazon · eBay |
| 9 | MUJI Oil Ink Triangle 3-Color Ballpoint Pen with Pencil 0.7 mm | $6–$8 | Amazon |
| 10 | MUJI Compact Fountain Pen | $15–$20 | Amazon · eBay |
The picks, in detail
MUJI Gel Ink Ballpoint Cap Type Pen 0.38 mm
The finest current capped gel option is the precise pick for monthly calendars, habit grids, and compact notes where each square has to remain readable.
- 0.38 mm tip
- water-based gel ink
- capped body
- refill available
- Keeps tiny writing controlled
- Low-cost refillable format
- Fine line is less dramatic for large headers
MUJI Gel Ink Ballpoint Cap Type Pen 0.5 mm
This middle-width capped gel pen is the balanced everyday choice for task lists and normal notes when 0.38 mm feels too fine.
- 0.5 mm tip
- water-based gel ink
- capped design
- replaceable refill
- Versatile line width
- Simple lightweight body
- Cap is one extra step during rapid list-making
MUJI Gel Ink Ballpoint Cap Type Pen 0.7 mm
Use MUJI’s broadest capped gel tip for section titles, larger lettering, and entries that need visibly more weight than routine planning text.
- 0.7 mm tip
- water-based ink
- anti-drying tip mechanism
- 14 cm body
- Bolder writing is easy to scan
- Smooth for larger lettering
- Broad line uses more page space
MUJI Gel Ink Ballpoint Pen Knock Type 0.5 mm
The click version of MUJI’s 0.5 mm gel format suits rapid checklists and planning sessions where repeatedly removing a cap becomes annoying.
- 0.5 mm gel tip
- knock-type retractable mechanism
- refillable body
- multiple ink colors
- One-handed deployment
- Good everyday journal line
- Mechanism adds a little bulk over a capped pen
MUJI Smooth Gel Ink Ballpoint Pen 0.5 mm
MUJI’s separate Smooth Gel line is a sensible primary writing pen for journalers who value a 0.5 mm gel point but prefer the newer smooth-gel refill system.
- 0.5 mm smooth gel tip
- knock-type body
- refill available
- water-based ink
- Comfortable all-purpose line
- Refills are sold separately
- Not as compact as the short-body pens
MUJI Smooth Gel Ink Ballpoint Knock Pen 0.3 mm
The 0.3 mm Smooth Gel Knock Pen is for very dense trackers, finance columns, and margin annotations where a regular 0.5 mm line crowds the page.
- 0.3 mm tip
- smooth gel ink
- retractable knock body
- color-specific refills
- Makes dense layouts practical
- Click mechanism is quick
- Very fine point can feel deliberate rather than fast
MUJI Smooth Oil Ink Ballpoint Pen 0.7 mm
A 0.7 mm oil-ink pen belongs in a journal kit for situations where you want a firmer ballpoint feel instead of the wetter look of gel ink.
- 0.7 mm oil-ink tip
- smooth oil formulation
- retractable design
- black, blue, and red options
- Bolder conventional ballpoint line
- Useful contrast to gel pens
- Less suited to tiny calendar boxes
MUJI Smooth Oil Ink 4-Color Ballpoint Pen 0.7 mm
This four-color oil pen replaces several loose pens for color-coded appointments, school subjects, or project keys without abandoning a familiar ballpoint line.
- four ink colors
- 0.7 mm oil-ink tips
- single multi-pen body
- retractable selectors
- Keeps a color key compact
- Handy away from a desk
- Heavier than a single-ink pen
MUJI Oil Ink Triangle 3-Color Ballpoint Pen with Pencil 0.7 mm
The triangle multi-pen adds a mechanical pencil to three ballpoint colors, making it the flexible field option for planning drafts before committing ink to a spread.
- three ballpoint colors
- mechanical pencil
- 0.7 mm oil ink
- triangular body
- Pencil and ink travel together
- Triangular shape is easy to identify in a pouch
- Not the lightest choice for long writing
MUJI Compact Fountain Pen
MUJI’s compact fountain pen is the deliberate, expressive option for titles and longer reflections, with a short body that is genuinely easy to keep alongside a notebook.
- compact pocket-size body
- fountain-pen nib
- black ink cartridges available
- A7-friendly format
- Distinct writing character for special pages
- Small enough for a journal pouch
- Fountain-pen ink and paper pairing need more care than ballpoint ink
Buying tips
- Start with one 0.38 mm pen for grids, one 0.5 mm pen for daily writing, and one 0.7 mm pen for headers; add colors only when your system actually uses them.
- Test a pen on the final page of your notebook before committing to a two-page layout, especially if the paper is thin or coated.
- Keep a compatible refill with the pen you use for recurring logs so a depleted ink tube never interrupts a month in progress.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.