Borderlands 3: Deluxe Edition includes:

Retro Cosmetic Pack: Vault Hunter head & skin, Echo Device skin, weapon skin
Neon Cosmetic Pack: Vault Hunter head & skin, Echo Device skin, trinket
Gearbox Cosmetic Pack: weapon skin, trinket
Toy Box Weapons Pack: 2 Toy guns, Toy grenade mod, trinket
Equipable XP & Loot Drop Boost Mods