+1 for Wilserbrewer bags.
Wilser, any chance straps would be incorporated in future bags?
No sorry, I have absolutely no desire to make a bag with straps. While the strap handles make wonderful advertising photos, I honestly don't feel they are much benefit while brewing. Without a drawstring, one would be back to using binder clips or something else to secure the bag to the kettle, a big advantage to the draw string and cord lock design IMO.
Having the bag slip off the kettle rim during a mash is a messy problem, much less likely with a drawstring.
The draw string is plenty strong at over 200 lbs break strength and can be easily attached to a lifting hook, what could be any easier? One attachment point vs four? The straps are attached to the fabric with stitching, while the strap may be quite strong, it is stitched to rather thin voile material and is really only as strong as the stitching and fabric, kinda like attaching a chain to a paper bag lol. I have read reports of the stitching pulling or stretching on bags with stitched handles or strapping. With a draw string, the weight is spread to the entire bag, and is stronger and more durable IMO.
The strapping on a bag gives the false perception of greater strength, a BIAB bag is only as strong as the material and stitching. We have weight tested our bags and are very confident they will easily hold many times the weight of a grain bill.
https://www.homebrewtalk.com/showthread.php?t=384445
Large batch BIAB
https://www.homebrewtalk.com/showthread.php?t=483965
For a smaller grain bill, or when not using a hoist, one can simply close the drawstring, and easily wrap their hand entirely around the gathered bag, I fail to see how a "handle" is needed or beneficial.
Lastly is cost. The brew bag with handles is considerably much more expensive, especially considering custom sizes or larger bags, and shipping. Wilserbrewer frequent sale pricing further spreads the cost advantage.
The design I use has been tested now for over 5 years and many, many bags, and has proven to be a success with zero failures under normal use. To start adding strapping and handles would only be a solution to a problem that really doesn't exist IMHO.
All of the above is merely my opinion and experience, some love bags with straps and handles, sorry just not for me.
Happy BIAB brewing!
* finally called into this thread that I have been avoiding due to a biased opinion

Thanks for your support!