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I have purchased two of the thin profile compartment boxes with the magnetics in the bottom. Mainly because they are very slim. But same problem with both. They do not keep the small midge flies from migrating. Problem is the top does not seal on dividers. So, I ordered a Umpqua UPG LT Standard Premium Fly Box . I have another one that is similar for large drys. And it works well for those. Hopefully this will do the trick. One thing Umpqua does with these, which is a simple design change, is "off set" the slots. Making it less likely to dislodge opposing flies.