This is the replacement Miele 6958862 Bag Holder for S7000 and Dynamic U1 upright vacuums. 
 
Part numbers and Alternate Part numbers
6958863, 6958862
 
The Miele 06958862 bag holder is a green bracket that clips into the top of the bag housing on all S7 series uprights.  This part holds the bag.  When the bag housing door is closed, this holder is moved up and seals the bag.