Just wanted to give a plug for Couch Guitar Straps and Belts which are vegan and made in the USA.
Some are made of recycled car safety belts while others are made of recycled vinyl upolstery. I've got a few of their straps and belts and they've worked out great. May fave is the Black/white racing stripe strap for my bass - its just perfect.
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www.couchguitarstraps.com]