YAWL (yet another winder for lines)

There are plenty of line winder models available, but I couldn't find one with all the features I wanted:

1) Holds starting end of line for easy winding with quick and easy wedge action, but line can instantly be completely removed from winder if needed.

2)Holds finish end of winding with simple wedge action, with allowance for winding length variation...you can wrap some line around the knob to take up the bit of extra after winding on the main ears. The two horns offer options depending on which end of the winder the line finishes on.

3)Quick and easy deployment, useable with left-over line still on winder.  One of the photos shows the winder hung from the "bow" of a Farrimond friction hitch.   This is similar to a tight-line hitch can be tied without passing the end of rope or winder through the knot.  Removing the winder from the loop and tugging the end will  completely untie the knot.

4)No provisions for antennas.   Many such  winders are designed by hams for SOTA/POTA use with portable antennae 

5) Effective use for hanging PCT style bear bag.

In case you are not aware, winding in a figure-of-eight pattern avoids putting twists into the line which reduces tangling.   Pinching the winder through the hole in the knob allows line to be quickly stripped from the winder with no tangles.   The photo of the full winder shows a couple of finishing wraps taken around the bulk of the line.   Depending on care taken when winding, some of the wraps can be a little loose.  The finshing wraps keep everything in place until it is time to put your tarp up.

I suggest printing this in ASA for UV resistance, with 4 perimeter loops and 4 top/bottom layers for strength.   The line creates quite a bit of force when wedged  under the horns.

This is the knot I recommend using with this winder: https://www.animatedknots.com/farrimond-friction-hitch-knot  

PCT bear bag technique: (Different Kevin)