I wouldnt use the leftover water personally, its got all the contaminants in it that you've just removed from your hash. Lucifer those are the exact bags I have, and considering I aint using kg's of trim every few weeks I think they're perfect. For the sake of €30 to get a few grams of free hash EVERY GROW (off trim you were probably gonna throw out) that will make you laugh hysterically at the next dealer who offers you soap/pollen/squidgy, I say everyone who grows should get them. And those ones might be the "cheap" ones, but I think the only thing that makes them cheap is they've no frilly decoration shite or a "brand name" on them, Iv used them twice, one time with an electric mixer and theres no signs of wear or damage.
BUT for the sake of €30 quid for the bags, a bag of ice from Tescos (87c) and a small round plastic bathroom bin (€2-€32, the more basic the better) even if you only got one run of 3 or 4 grams off the bags before they theoretically became damaged (which is unlikely) you'd still be making a profit (if you were mad enough to sell it) and have hash the kind you wouldnt even get in Amsterdam.
Just the important thing from my reading on EVERY Bubblebag site is; dont expect to get really high quality hash out if you put junk in and dont spend some time on it. Freshly frozen trim from a high quality plant processed in clean bags with clean ice in a clean bucket will make high quality hash. Dried out/squishy limp trim off a low quality plant in dirty bags with dirty ice in an unwashed bucket is gonna produce contaminated (and weak) junk. You cant make a high quality jacket out of a low quality cow with poor workmanship and tools
EDIT: Clean and dry your bags immediately after putting the last bit of hash into the pressing screen between two towels. A good tip Iv found actually is to load up/cool the bucket in the kitchen (access to ice, fridges, freezers, etc) but actually spin it and clear the bags in the bathroom. That way you can forget about spills, dump your mash/ice mix down the jacks when your finished (two loads with two seperate flushes, you dont wanna explain to a plumber what it all is if it gets clogged up!),wash out the bags in the shower and dry them off with a towel all without having to move! And by the time your finished washing out and drying the bags, your hash "cookies" will be ready to come out of the pressing screen onto a piece of cardboard. And DO NOT press them hard in the pressing screen! Just make sure its flush with the hash and then just GENTLY press a towel over it so the moisture leaves the hash through the screen into the towel without squishing the hash, cos if you press it wet, it will be unworkable.
Jesus, what a super-post...see what the hash does?! Maybe I should just post a detailed step by step tutorial, lol.