I had read somewhere that an HF member uses a pvc pipe (not sure of the size) and fills the pipe by hand (tarries the pipe to be able to get the weight of the down or simply puts his down on the scale and subtracts as he takes each time). Then with a slightly smaller pvc pipe so the fit is very close (covered/taped at one end) the second pipe is pushed through the first pipe and the down into the gear/baffle). For its simplicity this is what I will try.