import re

def sanitize_box_item_name(name):
    """
    Sanitize a string to be a valid Box folder or file name.
    
    Box Constraints:
    - No non-printable ASCII
    - No "/" or "\\"
    - No leading or trailing whitespace
    - No "." or ".." as the exact name
    
    Args:
        name (str): The original name
        
    Returns:
        str: Sanitized name
    """
    if not name:
        return "Untitled"
        
    # 1. Replace invalid path characters
    safe_name = name.replace('/', '_').replace('\\', '_')
    
    # 2. Remove non-printable characters (keep only space through tilde)
    # This regex matches anything NOT in the range \x20 (space) to \x7E (~)
    safe_name = re.sub(r'[^\x20-\x7E]', '', safe_name)
    
    # 3. Strip leading/trailing whitespace
    safe_name = safe_name.strip()
    
    # 4. Handle empty string after sanitization
    if not safe_name:
        return "Untitled_Item"
        
    # 5. Handle reserved names
    if safe_name in ['.', '..']:
        return "_{}_".format(safe_name)
        
    return safe_name