My wife lost her last repair kit when the velcro finally wore out and it fell off. The BOA works great and can be tightened so that there's no shaking/rattling. It's just big enough for the basics; tire repair, tire irons, and CO2 bottle inflator.
I put this on my wife's bike with tubeless tires. It carries the tubeless plug, a CO2 inflator, tire irons and a tube (if all else fails). I have a Crank Brothers multi-tool that I strap on the outside using the BOA closure. I got this because my wife lost her last bag when the velcro attachment had worn out and the bag fell off.