The following instructable details how to build your own gym/duffel bag. The pattern is simple, and easy to make. I chose to create my gym bag because I had an old sail that I wanted to re-use the canvas from, and I was in need of a new gym bag for school.
This is my second time creating a duffel bag from this pattern, and I haven't had a problem with it to date. The bags produced are able to take a beating, and still draw a lot of attention for their looks. So what's their overall best feature? They cost about 5 bucks to make!
Step 1: Materials
Since I create my duffel bags based on my needs, I use a random measurements in my pattern. In other words, I eyeball it. The measurements in this 'ible are based on my preference, and you can modify them to produce a duffel bag of whatever size you need.
-An Old Sail, or some form of sturdy material. I would highly recommend using canvas for this project, as it is a sturdy and durable material.
-A Carpenter's Square, or some form of measuring tape. A square will pay off when you need to trace out rectangular shapes!
-A Circular Object, I used a mixing bowl, this will be used to create the patterns for the two circular ends of your bag!
-A Zipper, its length is dependent on how long you want your bag to be.
-D-Rings if you are planning on making a bag with a shoulder strap
-Optional: Material for the handles I just used sailcloth