Portable fillable base weight for arches and columns. These can be filled with Sand ( make sure it us dry for easy pouring in) or Water. Weighs 9 kilograms when filled with water – enough to support a fairly large arch.

You will still need a  base of some sort below the weight – the easiest to make is the PVC one shown by Michael Floyd on his YouTube Channel – Balloon Animals  There is a hole through the middle of the weight which can take a a pipe up to about 22mm.