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I’ve been doing this since my 3rd batch a couple years ago. My false bottom was crap so I improvised and got a bag from my LHBS . I brew with a lot of wheat and haven’t had a stuck sparge since going this rout.
+1 for @wilserbrewer 's BIAB bags and his ratcheting pulleys; awesome quality and stellar service, his bags are easy to hoist but will never let you down!!
After mashing out with a good squeeze I drop it in a bucket to cool off before dumping into a trash bag. Some days I am too worn out to dump it right away so I let it sit for a day or two, in which case the naturally occurring lactobacillus in the grain has taken over and my garage smells like yogurt. I never "wash" the bag beyond spraying out with hot water and rinsing thoroughly, then hang dry it from the hoisting hook over my kettle.
If I had any doubts about the old bag's durability I would have a backup on hand, but 35 batches in it is as strong and trustworthy as ever.