In case you get sick of losing corks a more permanent fix is to run the vent from the port bag to the fitting on the starboard side of the boat and vice-versa. That will solve the problem, but will also force you to get used to the bags venting on the opposite side of the boat.

The zip tie trick works on smaller bags, but we've found on the 1,100, unless there is a lot of freeboard in the boat, it's impossible to get the hose higher than the top of the bag.