Heavy-duty Base Weights: 4 pieces of fillable plates are included, each capable of holding up to 15 L of water (approximately 15 kg), namely 60 L (56 kg of water/ 80 kg of sand) in total. Stackable for Easier Storage & Carrying: The 4 pieces of fillable plates can be detached and stacked when not in use. With a stacked dimension of 50.5 cm L × 50.5 cm W × 30.5 cm, this base stand is space-saving for storing in locker or car trunk etc. Professional Outdoor Materials: As a professional outdoor material that is widely applied in outdoor supplies, HDPE features excellent weather, capable of long-time serving outdoors to withstand all kinds of weather without fading.