I designed these of lids for for a set of Pyrex bowls whose lids had cracked, but they are easily scalable for any round bowl or container. When printed in PETG, the beveled flutes on the edge have enough give to snap over the rim of your container. These lids won't provide a water-tight seal, but they are great for fridge duty.

I've provided 6 different sizes (80mm, 95mm, 110mm, 130mm, 150mm and 175mm dia), which should get you pretty close to the right size for your container. From there, scale the STL file in X and Y in your slicer (leave the Z scale at 100%) to get an exact fit.

For example: If your container has a top outer diameter of 113mm, the closest nominal lid is the 110mm, so you would scale LID_110.STL in X and Y by a factor of 113/110, or 102.7%. Or if your container diameter was 127mm, you'd pick the 130mm STL and scale it by 127/130, or 97.7%. (i.e.: scale factor = your bowl dia. / nominal stock file diameter)

Note that most containers aren't perfectly round. You should use the widest spot for your diameter measurement. Also, you need to measure accurately (within about 1mm, ideally), so use dial calipers if you have them.