public static Bounds GetBoundsColliders(this ICollection<Collider> colliders)
{
    if (colliders == null || colliders.Count == 0)
        return new Bounds();
    var center = colliders.Aggregate(Vector3.zero, (centerColliders, collider) => centerColliders += collider.bounds.center, centerColliders => centerColliders / colliders.Count);
    var bounds = new Bounds(center, Vector3.zero);
    colliders.Each(collider => bounds.Encapsulate(collider.bounds));
    return bounds;
}