1) Make damn sure you're getting something out of it. It could be personal satisfaction, it could be meeting a challenge, or it could be exactly the thing you want doesn't exist. I make my own audio gear, some of my own outdoor gear, my own booze, weed, and even gochujang... and I can say for certain you will not save money by making your own stuff unless you already possess all the material and equipment. Well, maybe except for the weed.
2) A good sewing machine is a simple home machine that will do straight stitching and zig-zags. You don't need anything more and you really do not want an industrial machine. Most of the time you want to go really, really, really slow, and industrial machines are good at going all day 10x faster than you want.
3) Build a simple square bag first. In fact, i'd suggest doing so every time working with a new material. Some materials want to be rolled 3 times on the edges, some need backing, some benefit from a sharp needle, some from a ballpoint. Good to learn with something that isn't a big deal if you mess it up. Cinch bags and dry bag style bags are great. It also helps you visualize as you're going to sew your bags inside out, an then flip them around. Depending on how complex things get, it can be hard to visualize (like the multi-layer insulated skirt I made).
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