^if it for some reason was to fail and shoot the top off it wouldnt get lodged in his ceiling and would be retained by the handle.
I have 3x30L dewars and 1x50L with withdrawal device. The 30's maybe lose 1/4 of a liter a day, the 50 loses about half a liter a day.
If I could do it again I would have all 30L dewars. you can pour them off the floor or set them on top of a chair to pour them once they are half empty. they just lose a lot less than the 50L with top does.