We all want, badly, to help the bushfire victims.
Indeed because so many of us want urgently to do this there is no way any kind of material object donation (short of stockfeed, or long-term lending a house or caravan you own) can be helpful. To donate goods that haven't been specifically asked for is both wasteful and a nuisance. So don't do it. Send money. Sell the stuff you've got that you were going to donate, and donate money instead. If it's not sellable, then it's certainly not donatable.
I know that this is frustrating because we want to give meaningful gifts, we are not comfortable with giving plain old money and we do not think it adequately conveys the depth of our feeling.
Frustrating, yes. But, too bad - get over it, and send money. If you've bought stuff, take it back, get a refund, and send the cash.
Send money to the Red Cross. (International readers, this totally means you, too. Consider it a token of appreciation for whatever fun you've got out of reading this blog over the years.)