A wet keepnet or sling left in the car can produce a smell that is difficult to describe politely.
A proper stink bag is designed to contain wet nets during transport so the rest of your vehicle and tackle doesn’t absorb that smell.
Although carp anglers don’t normally use keepnets, the same type of bag is useful for wet weigh slings, unhooking mats and landing-net meshes.
The key is remembering that a stink bag is for transport, not storage.
Once you get home, take everything out, rinse it if necessary and let it dry completely.
Leaving wet fish-care equipment sealed inside a waterproof bag for days encourages mould and bacteria.
A zip or roll-top design also needs to be easy to clean because the bag itself eventually gets dirty.
It’s not glamorous tackle, but your car passengers will appreciate it.
What’s the worst fishing item you’ve accidentally left wet in the car?