Good link. I didn't know that there's a branch in Port Macquarie, I'll get a couple of cubes when I'm up there next. They look similar to the Craftbrewer fresh wort kits style and being in a regional area I have to be able to pick them up personally as postage wouldn't be cost effective. Also as posted Bunnings don't really have anything too flash. My Willows always sealed but for kegging purposes they are just too big (actually hold nearly 24L when they have been softened up a bit after a few brews) whilst the square ones are ideal for keg sized brews.
Another advantage of that style is that you can stack them two high in a Kegmate style kegerator for cold conditioning if you brew something that needs lagering for a while.
BTW my Bunnings 10L still seal well, been using them for a year, I'm getting the square ones for storage and lagering so I can get back in the swing for the comps next year but the 10L are still my workhorses.