shop › the butter yellow strap Image 1 of 4 Image 2 of 4 Image 3 of 4 Image 4 of 4 the butter yellow strap €95.00 The butter yellow strap. An interchangeable strap designed for all bon project bags. Crafted from left-over leather. add to cart Added! The butter yellow strap. An interchangeable strap designed for all bon project bags. Crafted from left-over leather.