Lost brown leather backpack with multiple compartments and a blue pom-pom keychain near Brighton seafront pier.

I think I lost my brown leather backpack while walking along the Brighton seafront near the pier yesterday afternoon. It has multiple compartments and a small keychain with a blue pom-pom attached to it. I realized it was missing when I got home and can't recall when I last saw it. I'm hoping someone might have found it and can return it to me.