I press a lot of rosin. I use about a gram a day. I don't use bags unless I'm pressing dry sift. No need for a bag if you pre-press into a puck. And, no, you DEFINITELY don't get debris if you do it right.
Even if you press plain buds without pre-pressing, any debris is usually on the very inside edge and is very easy to pick up or push aside with the rosin collection tool.
There are many ways to skin this cat. Pick your flavor. I generally only press 2 or 3 grams of flower at one time. If you see debris in this... you can have it.