i need a bag for my olympus pen e-pl1 with one of the two pancakes from panasonic attached to the camera. currently, i only have the 14mm pancake, but i will buy the 20mm pancake as soon as i can afford it. i already have two bigger bags, so i want this one to be as small as possible. of course, the bag shouldn't be too tight. it is also very important to me that the bag is weather-resistant. what would you recommend?