I used these guys the other day:
10 x 20L Hot Fill Wine/Wort Cask Bladder - Hot Cube Alternative (Irradiated)
The good:
- Nice to throw out after you're done with it and not have to worry about cleaning
- Works the same as a cube.
- Surprisingly easy to fill.
- Easy to minimise oxygen if you don't quite fill up 20L - looks like it does a much better job than kicking the air out of a cube.
The not so good:
- Hot as shit, making it hard to move after filling. I was scared to drag it, so kind of flopped it over itself. Would fill on a matt next time so could just drag the matt + bag out of the way somewhere.
- Was pretty hard to put the lid on, but probably get used to that pretty quickly.
- Bit difficult to pour into the fermenter; made a bit of a mess so would recommend doing it outside. I did a beer without only a small amount 'cube' hops so I could pour straight in. If it had lots of cube hops, I don't know how you'd go filtering them out (I use a sieve normally).
- You're throwing out more plastic.
Overall, I like it except for the extra plastic usage, which does suck a bit.
Toss up between saving water (no cleaning) vs more plastic in the environment I guess.