Oh, that's the worst, isn't it? You go to pull out the full trash bag and it just *rips*, leaving a gross mess stuck to the bottom and sides of the can. Totally been there. The main culprit is usually moisture and suction. When wet waste sits at the bottom, it creates a vacuum seal against the plastic. Don't worry, though—it's an easy fix with a few simple habits.
First, make sure your bin is completely dry before putting in a new liner. A quick wipe with a towel does the trick. For a more permanent solution, give the *empty and dry* interior a very light spray with cooking spray or furniture polish (like Pledge). This creates a slick barrier. Just a tiny amount—you don't want it greasy.
Another great trick is to use the bag itself. Before loading it with trash, drop a few sheets of dry newspaper or a flattened paper grocery bag into the bottom of the liner. This absorbs minor leaks and breaks the suction seal. Also, try not to overfill the bag. When you tie it off, leave a little air at the top; this helps break the vacuum when you lift.
If you're up for it, consider switching to a bin with a smoother plastic interior. Textured or ribbed surfaces grip liners more. And finally, give the bag a gentle shake or loosen the sides from the can before you heave it out. A little prevention saves you from a huge cleanup headache later!