If you want to hide from mobs or another player, then this is the perfect data pack for you. After installing, you can hide in tall grass, rose bushes, lilac, and peonies, by sneaking inside of them. In a cauldron or a composer, you also can hide in there by sneaking. But if you are in one of them you cannot hurt other entities. For hiding in chests, the chest must be empty (unless there would not be enough space), and you have to sneak above, by hiding in ender chests, the chest doesn´t have to be empty. To escape, just press space (or break the chest). Have fun!