Finished hand-stitched leather pen sleeve holding a fountain pen on a wooden workbench beside stitching tools.
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A Leather Pen Sleeve

ByPeter Joeseph 'Briefcase Maker' Kalafatis

One pen, one fold, one seam. The hard part is knowing when to stop cutting.

A leather pen sleeve is a strip of thin vegetable-tanned leather folded around one pen and stitched shut along the open side, so the pen rides in the bag in its own skin instead of rattling against keys, laptop corners and the brass of a lock. It is about the smallest closed object you can make on a leather bench. That makes it a good first build and an honest one, because the pen tells you right away whether you measured, and there’s no gusset or lining to hide a lazy seam behind.

Video: [DIY] Making a handmade leather pen case | Free PDF Pattern | making a unique gift!, from Shooka Leather on YouTube.

That’s Shooka Leather’s pen case build with a free pattern, not my channel. Watch it for the order of the work. What follows is my version of the same small job, with the reasons behind the steps and the place where my own habits are wrong for it.

Materials and tools for one sleeve

Thin leather, a pattern, a stitching kit you probably already own.

Hands measuring the girth of a fountain pen with a paper strip before cutting a leather pen sleeve.

Weight first, because that’s where people coming from bags go wrong. MAKESUPPLY’s free leather pen sleeve pattern shows its samples in 3.5 to 4 oz leather, about 1.2 to 1.4 mm, and warns against going past 5 oz unless you plan to do a lot of skiving. Galen Leather sells a single fountain pen sleeve in vegetable-tanned cowhide, hand stitched, with the edges beveled, waxed and burnished. That’s the target.

  • Leather: vegetable-tanned, 3.5 to 5 oz. An offcut does it.
  • Pattern: a printed paper pattern or a card template.
  • Cutting: a sharp knife, a steel rule, a cutting mat.
  • Marking: a scratch awl and a wing divider.
  • Punching: a diamond stitching chisel, a mallet, and a poundo board or other pad under the work.
  • Stitching: waxed thread and two harness needles.
  • Gluing: contact cement and something to press the seam.
  • Edges: a beveler, fine sandpaper, gum tragacanth or water, a wooden slicker.

Weaver’s pencil case kit is a good check on that list. It ships pre-cut natural veg-tan, hardware and instructions, and sells the tools separately. Its suggested tools run from stitching chisel and mallet to scratch awl, wing divider, bone folder, slicker and gum tragacanth, with 0.6 mm Ritza Tiger thread and an egg-eye harness needle.

Where the piece comes from on the hide matters less than usual. On a briefcase I want the bend, the tight butt of the hide. The shoulder is for small parts. A pen sleeve is about as small as parts get.

Sizing it to the pen, not the pattern

Measure the pen you carry. Then measure it again with the clip on.

A pattern is somebody else’s pen. Print MAKESUPPLY’s at full scale, the way the page says, because a pattern printed at the wrong size makes a sleeve that fits nothing. Then lay the pen you actually carry on the paper before the knife touches leather.

Length is the easy number. Galen says its sleeve takes pens up to about 14 cm long with a barrel of about 1.6 cm across, and lists the pens the seller tested in it. That gives you a sense of scale for a standard full-size fountain pen. Pens are not standard, though. Big Idea Design sells its leather pen sleeve in two sizes, full and mini, each matched to its own pens. That tells you the same thing from the other direction.

Girth is the number that bites. A strip of leather wrapped around a barrel needs the circumference, plus room for the seam allowance, plus the thickness of the leather itself on the inside of the fold, which is where the measurement on paper and the fit in the hand stop agreeing. Wrap a strip of paper around the widest part of the pen, clip included, and mark where it meets. That’s your inside line. The stitch line goes outside it.

My opinion: cut it snug. A loose sleeve lets the pen slide and knock. A tight one holds it like a holster holds a tool.

On my own bags I don’t use templates. I work with rulers and my eye, the way a sculptor works the clay in front of him, and I’d rather cut to the piece than to the paper. For this job I’ll admit the paper wins. A pen sleeve is one pattern made a hundred times, and a template that already fits your pen is worth more than any amount of eyeballing on something this small.

Cutting, folding and the stitch line

Score the fold, glue the seam, punch both layers at once.

Macro of saddle stitches and a burnished seam edge on a thin vegetable-tanned leather pen sleeve.

Trace the pattern onto the grain side with the awl and cut it out with the knife against the rule. Keep the blade upright. A leaning cut on thin leather shows up as a bevel you didn’t ask for, and on a sleeve both cut edges meet at the seam, so a lean on one side shows twice.

MAKESUPPLY’s order after cutting is plain: punch the stitching holes, fold the leather in half, line up the holes, stitch. Before the fold, run a bone folder or the back of the awl down the fold line on the flesh side and dampen it a little so the leather bends where you tell it to and not where it wants to.

Then the seam. On one thread on penturners.org, a maker called dogcatcher points to the knife-scabbard style, where only one side and the bottom get sewn. That’s the right idea for a sleeve. The fold is one long edge. You only stitch the other.

Glue the seam allowance, flesh to flesh, a thin coat of contact cement on both faces, tacky before they meet. Press it from the bottom up. Don’t clamp it with binder clips. Wenda at Wendaful built a glued faux leather pen pouch and found that binder clips leave indents. On real veg-tan they leave worse.

Now punch. Mark the stitch line with the wing divider, then drive the chisel through both layers with the mallet while the glue holds them still. A diamond chisel is the right tool here. In that same penturners thread, EricRN says the diamond punch gives “a more attractive stitch when using string,” while a round one suits lace.

Then stitch. Two needles on one waxed thread, pulled with the same force on every hole. I hand saddle-stitch everything I make and gave up sewing machines a long time ago, and on the hand stitching page I wrote that a good stitch is clean on both sides. On a pen sleeve the back side is the side that rubs the bag lining all day. It gets looked at more than you’d think.

Lock the end with a couple of backstitches. A sleeve gets opened at one end only. The seam at the mouth is the first stitch to take a pull every time the pen comes out, so it’s where you want the thread doubled.

Edges and the mouth of the sleeve

The seam edge gets burnished. The mouth gets the most care.

Galen’s sleeve is beveled, waxed and burnished at the edges. That’s the standard, and it’s not hard on a piece this size. Bevel the grain side along the seam, sand it until the two layers read as one, wet it with water or gum tragacanth, and rub it with the slicker until the fibers lie down and the edge goes dark and hard. The post on hand burnishing covers that stroke.

The mouth is a different problem. It’s an open edge on a single layer, it takes the pen’s clip every time, and it gets pinched between thumb and finger more than any other part of the sleeve. Bevel both faces there, burnish it harder than the seam, and round the corners so they don’t lift.

Some makers cut a notch. A Galen customer review mentions a small cut-out at the top edge that makes the pen easier to get in and out. That’s a buyer’s note, not the maker’s spec, but it points at a real fight. A snug sleeve holds the pen. A snug sleeve also holds the pen when you want it.

Condition it once, lightly. Thin veg-tan takes oil fast and darkens fast. A sleeve doesn’t need much feeding. It needs to stay dry inside, because a pen with a cap that leaks will find the flesh side of the leather and stay there. If that happens, the post on ballpoint ink is where to start, and the honest answer is that some of it doesn’t come out.

Where a sleeve earns its keep, and where it doesn’t

I build heavy cases. For this, I’d put the heavy leather down.

A well-used leather pen sleeve with a pen resting inside an open leather briefcase beside a notepad.

Here’s the case for the sleeve. Ross Adams at Pelikan from Pure Pens writes in a guide to pen cases that a case keeps a pen from scratches and knocks, and warns that “A knock or drop can damage the nib or crack the barrel.” He calls leather pouches the most durable choice and says they take on a patina with time. JetPens sells single pen cases on the same pitch: keep the pen safe from bumps and scrapes. Fair enough.

Then there’s the bag. I stay away from complicated interior compartments in the cases I build. Every loop and divider sewn into a briefcase is one more thing to wear out inside a thing meant to last. A loose sleeve does the job of a pen loop without asking the case to carry another seam. In my view that’s the better trade, and it protects the lining from the pen as much as it protects the pen from the bag. If you want the long version of what a case carries in a working day, the post on a professor’s teaching day runs through it.

Now the problem with my own habits.

Everything I know says thick. Thick bridle, heavy panels, edges you can lean on with your whole weight and not feel them give. Put that on a pen and it’s wrong. My opinion: the 5 oz ceiling on that pattern isn’t a pattern maker being cautious. It marks the point where a sleeve stops folding cleanly around a barrel and starts fighting the pen. The bridle I use for a briefcase is too stiff, too waxy and too thick for this, and if you cut a sleeve from it you’ll get a little leather pipe that bruises your thumb every morning and squeaks every time the pen comes out.

The glue-only crowd has a point too. Wenda’s glued pouch held. She did say sewing would hold more securely, and that overstuffing it was what would make it fail. One pen in one sleeve isn’t overstuffing. My opinion is still that a seam should be stitched, and on the writing pad portfolio every edge that carries a load is. But a sleeve carries almost nothing. The thread on it is there for the years, not for the weight, and it’s fair to say so.

So make it thin. Make it snug to the one pen you carry and nobody else’s. Stitch the one side that needs it, burnish the mouth until your thumbnail can’t raise a fiber, and then leave it in the bag long enough to pick up the shape of the barrel and the color of your hands, which on a piece of natural veg-tan this small happens faster than you’d guess.

12-Inch Stainless Steel Metal Ruler with Non-Slip Cork Backing: A 12-inch stainless steel ruler with a non-slip cork back. See it on Amazon (affiliate link).

X-ACTO #1 Z-Series Precision Utility Knife: A precision craft knife for fine cutting. See it on Amazon (affiliate link).

Fiskars 18 x 24 Inch Self-Healing Cutting Mat: A self-healing cutting mat, 18 by 24 inches. See it on Amazon (affiliate link).

General Tools Scratch Awl with Hardwood Handle: A scratch awl with a hardwood handle. See it on Amazon (affiliate link).

Weaver Leather Supply Diamond Leather Stitching Chisel Set: A set of 4 mm diamond stitching chisels for punching saddle-stitch holes. See it on Amazon (affiliate link).

Weaver Leather Supply Silent Poundo Board: A self-repairing poundo board for punching and stamping. See it on Amazon (affiliate link).

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