i am addicted to a web sales site called Zazz - every day they put up an item which is on sale one day only - usually techo geek stuff. But today they have a handheld vacuum unit - not a burn type sealer but i would guess the bags that come with it have a valve thingy. Looks good if you want to freeze or chill fish on the beach and won't be home for a couple of  day - just Google Zazz. Under $20.00.