Last year, my wife was telling me about some lady that she worked with. I guess her husband was a big-time fisherman on Lake Erie but he had to get both legs amputated because of sugar diabetes. I felt like crap for him , so I gave them a couple bags of walleye and a bag of perch fillets. They told my wife that it was the best fish that they had ever had. I kinda got the feeling that they hadn't had any in a while. Anyway, they thanked me by giving me a Foodsaver Vacuum Sealer that was only used a couple times.(Model 550). What type of bags do you guys use? Gallon? Quart? Rolls? How much can you put in a bag? Do you pre-freeze the fish for and hour or two like the manual says? Where do you buy the bags at? Any info would be helpful. Thanks.