Are you asking about the weight of just the box or the box plus all of the soil inside ? My suggestion is to save the bags that your compost, peat moss, etc come in and fill them with the Mel's Mix out of the box when you move. The box with no soil in it will weigh no more than the weight of the components when you build it. A 4x8 box will take three 8 foot boards, which do not weigh much. Build it with screws and you can take it apart and then put it back together at the new location and pour your mix back in.