One hundred and two pounds filled with sand and water, five and a half when drained - that swing is the whole argument for a fillable base in a garden that gets put away each autumn. Sand on its own gives 86 lbs, water on its own 6 gallons. A metal support pole and two plastic inserts take 1.5 and 1.9 in poles, covering most market umbrellas within 10 ft. HDPE stands up to sun, rain and frost without cracking or fading, and the surface wipes clean. It measures 22 in across and 12 in tall, a compact footprint for a small terrace.