A trumpet case will help you protect your precious brass instrument. If you don’t already own one, or it breaks, you can buy a hard case for your trumpet. However, if budget is a factor, you can also make your own soft-sided case, a gig bag trumpet case that will keep the instrument safe and secure.
Step 1 - Cutting
With the mouthpiece removed, lay the trumpet down on a piece of canvas and draw a rectangle around it that’s 2 inches bigger than the trumpet on all sides. It’s necessary to leave the allowance so the bell of the trumpet will fit comfortably in the trumpet case. Cut out the canvas and use it as a template to cut a second piece on canvas that’s the same size.
Step 2 - Sewing
Put the 2 pieces of canvas together, being careful to line them up exactly. Make a mark 3 inches in from one end. Using a sewing machine, join the 2 pieces of material along the remainder of that edge, along one of the shorter edges, and then along the other long edge, stopping 3 inches from the end so it seems as if you’ve created a larger pocket. Use heavy duty thread and test the seams for strength.
Step 3 - Lining
Turn the trumpet case inside out. Cut 2 pieces of foam rubber, each a little smaller than the sides of the trumpet case. Glue these to the inside of the trumpet case, one piece to each half.
Now cut a rectangle of velvet so that, when folded in half, it will fit inside the trumpet case. Apply glue to the foam rubber and fix the velvet in place. It should cover all the foam rubber and stop just short of the canvas itself. This will prevent the foam scratching the metal of the trumpet. Once the glue has dried, turn the trumpet case the correct way out so the lining is on the inside. Fit the instrument into the case. It should be held snugly but there should me enough material for the piece to join together over the bell of the instrument.
Step 4 - Fastening
The simplest way to put fastenings on the trumpet case is to use snaps for joining the 2 halves where you haven’t already sewn them together. Simply sew the snaps to the canvas and they can then be pushed closed and pulled open.
An alternative is to put in a zipper, although this will entail more work than just using snaps. It will, however, give firmer closure to the trumpet case. To complete the trumpet case you can sew each end of a long piece of canvas (around 2 feet or 2 1/2 feet) to one side of the canvas. This will act as a shoulder strap so that the trumpet case will rest of the back when walking. This makes it comfortable and out of the way, leaving the hands free.