Well if you are in Canada, a lot of folks take the empty milk bags and wash them well, using a weak bleach solution after dishsoap and rinsing throughly, open up the snipped end, and snip a corner off the opposite end and you are good to go - if you like disposables. Yes in Canada we have milk in bags, haha!
I used to buy the disposable bags and then I hit two batches of bursting bags and that was the end of them for me. Sometimes you get defective batches!
I, like Cali4Dawn, too use the parchments for smaller amounts of things, definitely for any candy melt or chocolate work as you don't waste a lot that sticks to the plastic. But for little bits of icing, they are terrific too.
I have to say though, if you are an old brawd like me or you have any hand issues - well the Wilton Featherweights can't be beat. I have bought cheaper versions, but they don't hold up as well and the seams tend to open up. But the Featherweights, preferrably in 8-10 inch size, half full, will alleviate a lot of hand issues. Took me a few years to figure that one out. You can grip them better and they aren't near as hard on your hands as the disposables.
But like Kiddiekakes, I found the big advantage of disposables was you could make up 12 colours of icing and not have to wash all of the dang bags, so that was a plus! Some folks wash and re-use the disposables, but I find the plastic gets hard and makes it hard on the hands too. So avoid getting old or developing hand problems Kidster!
I have tried lining the bags with freezer or sandwich bags but for me it causes some hand issues, guess it is that extra thickness of plastic sliding around in there. But it sure would make cleanup easier!
I do use freezer bags to bag my bagged icing - how is that for a mouthful! When I have a lot of different colours to use, I bag the icing and insert the bags in sealed freezer bags so there is no hardening and I don't have to stop to fill up my bags. I have those caps that fit over the tips, but find them hard to handle, so this works better for me.
Hugs Squirrelly Cakes