308boy, with all vacuum sealers like the one you have and the one I have you have no choice but to use embossed bags. The only vacuum machine that can use un embossed is the large catering ones that you put in and shut the lid on then vacuum. Ours use the vacuum first then seals so the embossed veins help suck the air out of the bag whilst the lid is shut tight.
I have a lava 300 vacuum machine, its very good but is a little pricey unless you get one 2nd hand on ebay
cheapest embossed bags I have found is from ebay again, they are the 'andrew james' ones