Since someone is always home with the dogs a better choice may be the Playsafe collar, it is designed for daycare type settings. It won't open by itself but it has velcro tabs that can be pulled open easily even if the dogs are tangled up. The advantage would be that you could use it to hold them without worrying about it accidently opening. But it's not really designed to have a leash hooked to it so you would have to put a regular collar on them if you were going to take them out.
That looks like a great alternative and I do think I'll give them a try. Although the dogs wear regular collars in the house, we always use martingales or sporn harnesses when we walk them.
I found the website interesting and was fascinated by the dog cold weather gear. Don't need it here but it was still fascinating. Those of you who live where there is snow - Would your dogs really wear a long legged, full body snow suit? Check out the Arctic Fleeces.
http://www.faithfulpetproducts.com/CoatsFloatsBoots.html
Pat