Model F1 is a size 195 x 70 x 35 Mm,F2 is 245 x 70 x 35 Mm, a F3 Reaches 295 x 70 x 35 mm. The difference between them is mainly in length at the same width and height. So you can choose a more compact option for shorter floats or a longer body when your tackles require more space in length.
F4 has different proportions: 315 x 55 x 22 mm. It is the longest of the variants mentioned, but it is narrower and lower than the others. This makes it a separate choice, not just a next size. Compare these sizes with the actual compartment in the luggage and with the floats you wear most often; The length itself does not decide whether the shape suits you.
For a daily outing, you don't need to wear all the floats you own. Select the required according to the fishing venue and the expected way of keeping, then place them without forcing the lid. If the box closes hard, check the arrangement instead of pressing the clasp. Secure closure works correctly only when nothing stays between the edges and there is no element that rests on the lid.
After fishing, dry the floats before storing them for longer. Clean the housing gently and inspect the hinges and fastening, especially after transport in a tightly packed bag. The practical box is the one whose dimensions match both the tackle and the storage space. In this choice, the model is defined by proportions, not just the designation on it.
Before you finish the arrangement around Plastica Panaro, go through Float fishing accessories and check how the boxes fit into the rest of the float tackle. Float Fishing Boxes and Classifiers is the logical narrower direction for this fishery, while Boxes, binders gives a comparison to the general category according to your storage method.