CLM I made some cushions with 2 pieces of fabric with the fibre fill in the middle and then just held the three together with pins and whip stitched the edges. I did turn the edges over but there was no difference than those cushions i made by machine stitching the pieces together,then stuffing, then sewing the fourth side shut. You couldn't see any difference at all.
This is a very flexible technique and any adaptations based on ability or patience or time are fine i think, in fact if they are more to your taste then they are great.
I'm half way through my shoulder bag but as for making the handle mmmmmmmmmmI was considering either scavenging a handle off an old bag or just rolling some fabric into a ermmmm roll and whip stitching it of possbly plaiting some cord or fabric. I may take a 20 cm wide strip of fabric and machine sew it length ways and having sandwiched some flat fibre fill in the middle I shall machine sew quilt it. I nice broad strap is more comfortable. I dunno yet though not sure what to do.
Here is my work in progress..........There is a LOT of embellishments to go on yet and I am considering doing the front flap in the standard Teesha style.
front and back
Teesha style front panel ( this is a diary cover but to give you the idea)
I intend to whip stitch between the patches / panels and also to embroider with tiny stitches all over plus the usuall bobbles and embellishments
I may be some time.