I've never used that exact small cooler myself, though from earlier models I've owned, they often collect condensation, which usually comes from the door not closing tightly enough. Sometimes the hinge alignment prevents a good fit, or the rubber lining just doesn't cover everything. In those cases, I added some automotive stripping around the edge to improve the contact, and it stopped the buildup. Can't say for sure if that's happening here though, results can differ.
We bought a small fridge. The freezer works fine. The problem is the fridge section ends up completely wet inside. I've come across videos that treat this as a known problem and advise against using the unit. We have containers with silica packets for moisture but it still looks like it could be an issue. This just doesn't seem like a solid clinical setup for keeping sterile peptides. Has anyone used this kind of setup for years? We are still in the testing stage and have not stored any peptides yet. The heavy moisture buildup is not encouraging.