To make a pouch like that you can use the instructions of Matthias woven pouch (
http://slinging.org/forum/YaBB.pl?num=1168848146/10#10 ), but use more strings to start of with, and take them longer than you want your pouch to be, I think 10 to 20%, depending on how you weave.
Matthias leaves the weft a little loose (that is the one string he is adding), while the warp is rather tight (those are the strings on the frame). To make a pouch like mine you pull the weft tight each time before and during the pushing up action, and you let the warp loose, you will have to lengthen the sting with which it is tied, most likely.
Making a pouch with no split is even easier than one with a split, just go on weaving like you do for the first bit, forget the talk about adding a second string and so on. You might want to pull your weft a little less tight in the middle of the pouch, to make it wider, and pull harder again after the wide part.
Instead of using a new set of strings for the pouch, you can also use the strings of the braided cord, and just add as many as needed to get a wide enough pouch, (that is what I have done, with as extra difficulty that I changed colour of string for the different cords, but I used knottyers tricks to do that.)
Willeke