Magic does not make an item indestructible. If fire burns leather or acid eats steel, a magic version of that item can also be burned or eaten. A magic sword can still chip. A magic cloak can still tear. Protect your gear.
Unlike ordinary equipment, magic items retain their enchantments indefinitely unless specifically dispelled, destroyed, or used up. Magic, however, does not make an item indestructible.
A potion is still a liquid in a simple glass vial that can crack or shatter. A scroll is still parchment that can tear or burn to ash. Magical armor can be eaten away by acid just as easily as mundane steel. Enchanted blades can chip or snap if struck with enough force.
If a magic item's physical form is broken, burned, corroded, or otherwise ruined, its enchantment is lost along with it. The only exceptions are true artifacts or other legendary relics, whose durability is tied directly to their immense power.