Food save makes pre-made bags that have some absorbent material just in front of where the seal takes place so that if the contents are wet the water gets caught in that material. I used them once but didn't like them. Liquid has never been an issue with me. Like others said just make sure the meat is dry.

I have been using food saver for years and I probably get a 95% success rate with my sealing. Seems that sometimes a small portion of them will leak over time. I always buy the food saver bags an do not buy any off brand or cheap versions of the sealing bags.