I use a bag with a separate tail clip (convatec natura and hollister pouch clamp) and the clamp it slightly bigger than the convatec ones. It basically looks like those clippits things you can buy to clip sandwich bags or freezer bags closed. With the hollister ones you can fold end of bag inside it so end is not exposed. Much prefer it to the velcro ones which end up having to be folded up so many times there is not much drainable bag space left so have to empty it too often.
Oh, forgot to say. Yes the clips that are supplied with the bags are useless and I just throw them away. Far too thin and fiddly.