on saleTWSBI Vac Mini Fountain Pen - Smoke

Product Code TW-M7445940

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out of stock

on saleTWSBI Vac Mini Fountain Pen - Smoke

Product Code TW-M7445940

In Stock

out of stock

Nib Guide

Not sure which size nib is best for you?

Try our Nib Nook tool to view and compare nib widths using our writing samples. Learn more ›

TWSBI Vac 20A Ink Bottle - Black
Add an Inkwell + $14.99 TWSBI Vac 20A Ink Bottle - Black

TWSBI Vac 20A Ink Bottle - Black

Product Code TW-M7444580

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The TWSBI Vac Mini is a slightly shorter version of the Vac700R. This clear demonstrator fountain pen fills via a vacuum filler mechanism, has translucent grey accents on the grip and piston knob, and has a stainless steel nib.

TWSBI's belief is that it is important to allow the user to disassemble and reassemble the pen and completely experience the traditional aspects of owning and using a fountain pen. These pens also come packaged with a wrench and silicone grease. Neither of these accessories are intended to be used immediately, as they are for long-term care and maintenance. Additionally, please use extra care if you choose to disassemble the nib and feed, as the feed is very fragile.
Fountain Pens
Clear, Silver/Grey

Whether or not the barrel of the pen is translucent, allowing you to see the ink and filling mechanism inside.

Body Material
Cap Rotations

For pens with a screw-cap closure, how many rotations it takes to uncap/recap the pen.

Cap Type

How the cap is opened/closed from the barrel of the pen. Some common options include Snap-Cap, Screw-Cap, Magnetic Cap, or Capless (no cap).

Compatible inks & refills

Which ink this pen will accept. Choices include bottled ink and various styles of pre-filled ink cartridges.

Bottled inks
Filling Mechanism

How the pen fills with ink. Click here to watch our video tutorial on common filling mechanisms.

Grip Material
Nib Size
Extra-Fine, Fine, Medium, 1.1mm Stub
Nib Color
Nib Material

Whether or not the cap fits securely onto the back of the barrel when open.


Whether or not the nib/tip can retract into the body of the pen (usually for click or twist-open style pens).

Diameter - Body
13.3mm (0.52in)
Diameter - Cap (without clip)
14.6mm (0.57in)
Diameter - Cap (with clip)
17.9mm (0.70in)
Diameter - Grip (mm)

Measured from the place most people choose to rest their fingers, which varies with each pen.

Length - Body

The measurement from the back end of the barrel to the tip of the nib.

114.3mm (4.50in)
Length - Cap
57.4mm (2.26in)
Length - Nib

The measured length of the visible portion of the nib when it is installed in the pen, from grip to tip.

19.4mm (0.76in)
Length - Overall (Closed)
124.8mm (4.91in)
Length - Overall (Posted)

When the cap of the pen is posted onto the back of the pen body, this is the measurement of the entire pen including the nib.

151.7mm (5.97in)
Weight - Body

If a converter is included with the pen, this weight is reflected in the total.

15g (0.53oz)
Weight - Cap
9g (0.32oz)
Weight - Overall (g)
Max Ink Capacity - Piston Vac

The maximum volume of ink that can fit in the pen when using the built-in piston or vacuum filling mechanism.


Customer Reviews

Based on 52 reviews
Chase T.
Wonderful work pen

I own a full size Vac 700,and it is a tremendous every day workhorse writing tool, but I wanted something a bit more pocket friendly for Travel, and packing along in my work bag. This fits the bill perfectly. Almost half the size of the full 700 capped, and nearly the same length posted. I ordered this with an EF instead of the F on my full, and there is a noticeable difference in the line width. My full is a bit sloppy for crosswords but this mini is nice and crisp. It will be replacing my Pilot Metro in that duty as well.

Lenny P.
Love my Vac Mini

I own several Twsbi pens but my hands-down favorite it my Vac Mini. It has the best flow, feel, and size. I use it everyday and is a constant companion along with my bullet journal. Thank you Goulet Pen Co for introducing me to the Twsbi line. I am a fan of both.

Dr. M.
The best pocket pen ever

I'm actually on my second Vac Mini. I bought one from Goulet as soon as they came out; I loved the Vac-700 (now 700R), and I thought this would be a great portable version of my home-study 700. It absolutely has been the best everyday carry (EDC) I've ever had, and my collection ain't small at this point. Being able to completely seal the large ink chamber is great, and starting the pen has generally been quite easy. I've used it so much in so many places I accidentally dropped my first one, stepped on it, and cracked it. :( I've tried to be careful with my second one, which still comes with me every day in a leather pen sleeve, ready for quick notes, signatures, what have you. One of my all-time faves!

Peter M.
TWSBI Vac Mini

Like my other TWSBI pens this one is also a fine one. I have only used it a short while but I really like it. I think, so far, it's a winner.

Royce K.
Twsbi vac mini and the vac bottle.

This pen is a delight to use with the vac bottle. I now own 4 of the Vac Mini pens and will buy one more.

FAQs about Fountain Pens

How do I fill a fountain pen with ink? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

It depends on the pen's filling mechanism, which you can find in the Technical Specs section above. 

Here's a quick definition of the most common filling mechanisms:

  • Cartridge - A small, disposable, sealed plastic reservoir that holds fountain pen ink. These come pre-filled with ink, and typically you just push to insert them into place and you'll be ready to write! Check out our quick guide here.
  • Converter - A detachable and refillable ink reservoir that allows you to use bottled ink in a cartridge-accepting pen. Typically you will install the converter into the grip section, dip the nib/feed into the ink, and twist or pull the converter knob to draw ink into the converter. Here's a video for how to fill a cartridge/converter pen using a LAMY pen as an example.
  • Eyedropper - A pen that utilizes the entire barrel as a reservoir for ink. Ink is directly filled into the barrel, allowing for a high ink capacity. Here's a video on how to do it!
  • Piston - A type of filling system that uses a retracting plunger inside a sealed tube to draw ink into a pen. They are typically either twist or push-operated. These pens cannot accept cartridges or a converter, and only fill from bottled ink.
  • Vacuum - A push-style piston that uses pressure to fill the large pen body with ink. They seal the ink chamber when closed, making it ideal for flying without risk of leaking. Check out our video on how to use a vac filler here.

Check out more info on these filling mechanisms including a video on how to fill each one on our blog.

How do I clean a fountain pen? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

It depends on the filling mechanism, but it mostly comes down to flushing it out with water, and sometimes a little bit of Pen Flush if the ink is really stuck. 

It's a bit easier to show than to tell, so we've put together a few quick videos showing you the process:

How often do I need to clean my fountain pen? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

We recommend a good cleaning every 2 weeks, and any time you change ink colors. 

Water will usually do the trick, but we recommend you use our Goulet Pen Flush if the ink has been left in the pen for a while and could have dried up, or when you’re switching ink colors.

My pen won’t write! What do I do? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

First things first... make sure you have ink in the pen! Be sure that the ink cartridge or converter is seated properly in the pen, and that you aren't out of ink.

We always recommend you give your pen a good cleaning first, using our Goulet Pen Flush, or a drop of dish soap in some water. New pens often have some machining oil residue left in the feed, so a good cleaning often does the trick first.

If that still doesn't work, try priming the feed. This consists of either dipping your pen nib and feed in ink, or forcing ink from the converter down into the feed. 

If it’s still not working after that, please reach out to us so we can help! 

What's your return policy? 8EDA1617-F73A-4DAF-8245-6D2BF4ABEB7B

You can submit a return request within 30 days of your order date. You can read all our Return Policies here.

To initiate a return, please submit a request at the Return Portal. Our Customer Care team might reach out to you for more information.

Please note we are unable to accept a return of any Namiki or Sailor Bespoke fountain pen for any reason once it has been used with ink. Please thoroughly inspect and dry test the pen before use.