How to Use a Rotary Cutter for Bag Making
By Klum House: Bag making kits, bag sewing patterns, waxed | Published: 2026-10-21
Category: How-to Guides
Learn the essential steps for using a rotary cutter safely and accurately when cutting fabric and leather for bag making projects.
Quick answer
To use a rotary cutter for bag making, start with a sharp blade, a self-healing cutting mat, and a quilting ruler. Apply even pressure and always roll away from your body for safety.
Why a rotary cutter beats scissors for bag making
A rotary cutter gives you straighter, more consistent cuts across multiple layers of fabric or leather. This is especially useful when cutting bag panels that need to match exactly. Scissors can shift the fabric as you cut, but a rotary cutter paired with a ruler keeps everything in place.
Choosing the right blade size
45mm blades, like the one on the Kai Rotary Cutter, are the most versatile for bag making. They handle medium-weight fabrics, waxed canvas, and thin leather well. For thicker leather or multiple layers, a 60mm blade gives more cutting depth. For tight curves or small pieces, a 28mm or 18mm blade offers better control.
How to cut fabric and leather with a rotary cutter
- Prepare your work surface and materials: Place a self-healing cutting mat on a flat, stable table. Lay your fabric or leather flat on the mat, smoothing out any wrinkles or folds. If cutting multiple layers, pin or clip them together at the edges to prevent shifting. Always cut on a self-healing mat to protect your blade and work surface.
- Align your ruler and position the cutter: Place a quilting ruler on the fabric along your cutting line. Hold the ruler firmly with your non-dominant hand, keeping fingers away from the edge. With your dominant hand, hold the rotary cutter like a pizza cutter, with the blade guard facing away from you. Keep your fingers at least an inch from the cutting edge to avoid injury.
- Make the cut with steady pressure: Press the cutter down so the blade engages, then roll it along the ruler edge in a smooth, continuous motion. Apply firm, even pressure—do not saw back and forth. For thick or layered materials, you may need to make two passes. Always roll away from your body. One smooth pass gives the cleanest edge. If the fabric frays, your blade may be dull.
- Change blades regularly: Replace the blade as soon as you notice it pulling or snagging the fabric. A dull blade requires more pressure, which increases the risk of slipping and injury. The Kai Rotary Cutter includes one blade; replacement 45mm blades are widely available. A sharp blade is safer and produces cleaner cuts. Swap it after every few projects or when cutting abrasive materials like leather.
Recommended tool
- Kai Rotary Cutter: This Kai 5045 rotary cutter easily cuts through leather or multiple layers of heavy-duty fabric. Its 45mm blade is only exposed when pressure is applied, for extra safety. The safety mechanism reduces accidental cuts, and the 45mm blade handles the most common bag-making materials without needing frequent blade changes.
Kai Rotary Cutter
