Here is an Egyptian style sling in paracord for tennis balls, using a new (to me) soft-loom method. This method probably has a proper name and a long history but I dont know it. I developed it from my earlier paracord sling tutorial here: http://slinging.org/forum/YaBB.pl?num=1340105523

This method takes a lot of time but is otherwise quite easy. There are no tools required apart from the usual scissors and a lighter. I do use a large eyed blunt darning needle at the end, but even this isnt an absolute necessity. There is a thing you can get called a paracord needle, I dont have one but it would probably be helpful here too.

First, set up the soft loom. The sides of the loom are 80 cm long, folded and reverse-twisted then tied off. Keep them about 20cm apart, this is what all the other dimensions are based off.

The warps are 4 metres each, these turn into the sling cords later. There will be some excess to cut off.  Zig-zag the first one through the twisted sides of the soft loom so you get 15 warps. Adjust the excess at each end to be roughly equal, you dont want to end up with not enough to complete the cords!

Next run the second warp though the same gaps in the opposite direction. Take time to get the tensions right now, it will make everything else much easier.

Now it is time to form the pouch. The first central row is there to hide the seam. Without this, the places where the row ends meet have little triangular gaps up the centerline of the pouch which is kinda ugly.

Check the length of both sides, they need to be equal. You can see on mine I didnt get that quite right, it shows in the photo but I didnt see it at the time. I recommend taking a break at this point and coming back to it with fresh eyes. This is make-or-break stuff so get it right.

Once the pouch is formed you can take the sides of the soft loom off. The ends of the warps can be pulled tight to the sides of the pouch, working in sequence from the center to each end.

This looks ugly. Its fatter at one end than the other, and slightly lopsided too. Both of these can be fixed.

Another round of warp tightening took care of the fat end. The lopsided bulging side was fixed by tightening the outer wefts on that side. This is why the final outer row was only partial on each side, it makes final adjustment easier. A last bit of warp tightening took in the slack left by the removed bulge.

The end result. It takes a lot of time and a lot of paracord and it weights a lot for a light ball. Objectively, it probably isnt the best tennis ball sling design out there. What it does do is look amazing and impress the heck out of people.

You never cease to amaze.

Very impressive.  Looks good

Very nice indeed. I've got my loom setup to make a linen version of this but I have a couple other slings to do first!

Looks awesome!