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SBSheath Bench Notes

Choosing Leather for a Knife Sheath

What thickness and type of leather suits a knife sheath, what leather ounces mean, and why vegetable-tanned leather is used for wet forming.

Updated 2 November 2026

Two questions settle most of this. What type of leather? And how thick?

A short way to choose sheath leatherPick vegetable-tanned leatherCompare the thickness ranges the makers giveCheck how the cuts of the hide differWet it and form it to the knife
Work down the list before you buy.

Type: vegetable-tanned

Pick vegetable-tanned leather, often shortened to "veg-tan". That's the usual choice for wet forming.

  • Tandy says to choose vegetable-tanned leather for wet forming because it holds its shape well and is easy to work with when wet.1
  • Vegetable tanning uses tannins, which occur naturally in the bark and leaves of many plants.2
  • Vegetable tanned leather is used in leather crafting and in making small leather items.2
  • Old moulded leather, called cuir bouilli, also generally specified vegetable-tanned leather.3
  • Plants such as quebracho, chestnut and mimosa give the leather its colour and fibre density.4

Chrome-tanned leather is the other main type. It's tanned faster than vegetable-tanned leather.2 The sources saved for this site don't cover chrome leather for sheaths, so this page doesn't say how it behaves when wet.

Thickness: what "ounce" means

Leather thickness is often given in ounces in the US and in millimetres in most other countries.5

  • An ounce is a measure of thickness, not weight in your hand.5
  • One ounce is about 1/64 inch, or about 0.4 mm.5
  • So a 4 oz leather is about 1/16 inch (1.6 mm) thick.5

Too thin and it won't hold up. Too thick and it may be hard to sew or fold.5

What the makers say

These sources don't all agree. They describe different designs, so treat the numbers as a range to think about.

Source Leather for the sheath
Tandy veg-tan guide 7 to 8 oz for narrow belts, knife sheaths and small holsters4
Tandy thickness chart 7 to 10 oz for belts, holsters, knife sheaths and structured cases5
Knifemaking book (Grit) 7- to 8-ounce vegetable-tanned leather6
Art of Manliness Medium weight, 5 to 6 ounces7
Weaver Main body 4 to 5 ounces, plus 2 to 3 ounces at the tip and throat8

The Weaver design adds a 2-to-3-ounce piece at each end, because the tip and throat need a touch more durability.8

Why heavier leather is harder to mould

  • Weaver says wet molding becomes a challenge with the heavier weights, 7-to-8-ounce and 8-to-9-ounce.8
  • It's a trade. Lighter weights give tighter bends and corners, but durability may be compromised in exchange.8
  • Thickness also changes the pattern. Leather is thicker and more cumbersome than paper, so you might need to make your design bigger.6

The cut of the hide

Different parts of a hide behave differently.4

  • Bends and butts are the stiffest and most durable. They typically have the fewest natural defects.4
  • Shoulders are strong and durable, with a little more flexibility.4
  • Bellies offer more stretch and are generally less consistent in thickness.4

Which side faces in

The patterns in two tutorials go on the rough side. One traces onto the wrong side of the leather, the fuzzy suede part.7 The other places the pattern on the rough side, which becomes the inside of the sheath.6

Once the leather's chosen, move on to drawing the pattern.

Further reading and sources

  1. A Beginner's Guide to Wet Forming Leather, Tandy Leather
  2. Tanning (leather), Wikipedia
  3. Cuir bouilli, Wikipedia
  4. The Tandy Veg Tan Difference, Tandy Leather
  5. Leather Weight and Thickness Chart, Tandy Leather
  6. Fashion a Leather Knife Sheath, Grit, from A Modern Guide to Knifemaking
  7. How to Make a Sheath for a Knife (Or Anything Else), The Art of Manliness
  8. Wet Molding Veg Tanned Leather, Weaver Leather Supply