Yes, that is interesting. I've yet to see anyone try this with a day bag, and I doubt these little bag things in the picture would ever see use outside of very niche competitive shooting groups.
It appears at first glance to be unfeasible to balance a day bag on top of your thigh to support your elbow while kneeling or sitting, and somewhat difficult to hold a day back between your supporting arm and chest while standing. Perhaps if your day bag was uncharacteristically light and was fitted with appropriately design straps to secure it to your body in those positions, it has the potential to work, but under most circumstances, I don't see the advantage in training for such an unlikely eventually, much less having shooters try and compare their ability to do so. Personally I wouldn't rate using a bag to support my limbs as any improvement, as there is already sufficient limb on limb support for in my sitting and kneeling positions. I would certainly use aids to support the rifle of course, if available.
@ebf, I teach shooters to avoid knees on elbows in the kneeling or sitting position as it poses inferior stability (due to the obviously small contact areas and inherent wobble) compared to placing the muscle behind the elbow joint on the knee, or the elbow on the thigh behind the knee, or better yet aim to achieve 'muscle on muscle' contact. Unless the shooter is too old and/or inflexible (not meant to cause offence).
But that's just my subjective opinion, and what I teach based on my experience. At the end of the day, if different techniques work for you and get rounds where you want them, I certainly don't discourage it.
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