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. Notify me when it's back in stock. sign up to receive news and updates. add to cart Added! The butter yellow strap. An interchangeable strap designed for all bon project bags. Crafted from left-over leather.