Cubitainers are pretty good - about as air permeable as most polyethylene plastic bottles. I think the bag-in-a-box wine containers are less permeable as they are made from metalized mylar.
You can buy the spigoted mylar bags, sans wine, for about $1 each.
The cubitaner bags can develop cracks in the corners without warning [ask me how I know this...]. Best to keep them in a big plastic storage tub or over a sink.
I now use Nalgene bottles for just about everything. Another very good container is the PET plastic Vodka jug - the pour spout is calibrated to dispense 10ml/second, great for HCA and other non-critical applications.