Cleto Reyes makes a bladder that has both a bottom valve and a top one. However I would wonder if it would be able to fill a 10x12 bag without a catastrophic failure.
http://www.ebay.com/itm/Cleto-Reyes-...item20dbc937a1
http://www.ebay.com/itm/Cleto-Reyes-...item20dbc937a1
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