How many grams of wax your containers need.
1296–1377 g of wax
216–229.5 g per container, at 300 ml each.
Assumes wax fills 80–85% of the stated container volume, leaving headroom for the wick tab and safe burning. Wax densities are approximations — check your supplier's technical data sheet, and allow a little extra for wax left in the melting pot.