Souldier is a Chicago-born accessories company founded in 2005 by Jen Tabor, who began stitching guitar straps from vintage fabric and recycled seatbelt webbing as gifts for her bandmates while working as a music teacher. The brand is built around a distinctive aesthetic that pairs salvaged 1960s and 1970s deadstock textiles — much of it sourced from defunct Chicago strap makers — with seatbelt backing and leather ends, all assembled by hand in the United States.

The company's catalog centers on guitar, bass, banjo, and ukulele straps in vintage Ace and Bobby Lee–inspired patterns, alongside bags, belts, wallets, pet collars, and other small leather goods. Souldier offers custom and personalized straps and has produced signature and partnership pieces with bands and brands including Wilco, Jack Spade, the Austin City Limits Music Festival, and Martin Guitars.

The straps have appeared on stage and in studio with a range of artists, with notable sightings including Jeff Tweedy on Saturday Night Live and Taylor Swift's 2021 Grammy performance. The brand operates direct-to-consumer through its website and is stocked by independent music retailers such as Chicago Music Exchange and Rock N Roll Vintage.

Souldier has 14 products cataloged on Equipboard, including Straps & Strap Locks. Their gear is featured by 8 artists, with the strongest followings in Rock, Pop, and Folk, World, & Country. Notable users include Johnny Marr, Jamie Cook, and Phoebe Bridgers.