I am currently in Denmark without access to a car. During the weekend I use the bus to go to some remote coastal place in order to fish. It takes 1 hour to reach that place. I carry one rod with me and some food/tackle inside a backpack.
Because coolers are really heavy to carry by hand, when I catch a fish, I release it. However, sea trout is really tasty here in Denmark, so I would like to be able to bring one with me back home.
From what I read online, the best way to preserve a fish is to gut it immediately and throw it in a cooler packed with ice. Another option is to keep it alive as long as possible, but the fish will have to die before I leave, which means it would have to be dead inside my backpack for at least an hour that I need to reach home.
To me it sounds that I need to buy a cooler no matter what. The weather these days is 15C/59F. I usually spend 5-6 hours fishing. Could I preserve my fish fresh by buying one of these bag coolers they sell online, for example this one?
Has anyone tried these types of bag coolers before? How was your experience? What other options do I have?