You can siphon it, or most of it. The hose has to be just a little higher at the starting end. Do you have a window or balcony you can hang the other end out of? If so, you can siphon the whole thing by hanging the end out lower than the starting end.
Edit: If you don't have a window or balcony you can use, see if you can raise the punching bag stand just a little by wedging things under it. That will allow you to siphon more out.
crackinmypants t1_j5ahv39 wrote
Reply to How to get rid of big punching bag plastic container filled with water? by fancy_the_rat
You can siphon it, or most of it. The hose has to be just a little higher at the starting end. Do you have a window or balcony you can hang the other end out of? If so, you can siphon the whole thing by hanging the end out lower than the starting end.
Edit: If you don't have a window or balcony you can use, see if you can raise the punching bag stand just a little by wedging things under it. That will allow you to siphon more out.