Shawn, your supposed to use a canister when you marinade! Just leave the marinade about an inch below the canister top and you won't have that problem. I'm not sure if all foodsaver's come with the hose attatchment for vaccuum packing canisters tho. If you don't have that option on your foodsaver then I would forego the foodsaver-marinade process. I can see what a problem it would be trying to seal a bag with liquid in it. Not to mention those bags are spensive'!....
Oh yes, for what its worth the chicken breasts I cooked came out great. Not sure if the vaccuum packing made a difference tho as I didn't have a control group. I did however jacard two of the breasts and left two alone. Although both were excellent, I liked the non-jacarded ones better. They seemed a bit more tender.
ron