Eskies (coolers) or big buckets with lids are better for big fish. The big fish often puncture the plastic bags and run out of air or water. That can't happen with a bucket. Small fish are fine in plastic bags but you need access to the bags and not every pet shop is willing to give them away.
Most people that keep fish have buckets for water changes, so it's not a big step to use those buckets for transporting fish.
You can drill a 6mm hole in the lid and put a rubber grommet in the hole. Then push some airline through the grommet. Have the lid firmly fitted to the bucket and an airstone on the airline, and put the fish and some water in the bucket.
I used to collect fish and transport them hundreds of kilometers this way and never had an issue. I used 45 litre plastic rubbish bins with lids and put them on the back seat of the car. I used seat belts to hold them in place. I used a power inverter that ran off my cigarette lighter in the car to run a normal airpump for air.
The biggest issue with transporting fish in a car is over heating. Cars heat up and the water can warm up pretty quickly. If you have a long way to travel, have the car's air conditioner on while transporting the fish. It will stop the interior of the car getting hot and cooking the fish.
Most people that keep fish have buckets for water changes, so it's not a big step to use those buckets for transporting fish.
You can drill a 6mm hole in the lid and put a rubber grommet in the hole. Then push some airline through the grommet. Have the lid firmly fitted to the bucket and an airstone on the airline, and put the fish and some water in the bucket.
I used to collect fish and transport them hundreds of kilometers this way and never had an issue. I used 45 litre plastic rubbish bins with lids and put them on the back seat of the car. I used seat belts to hold them in place. I used a power inverter that ran off my cigarette lighter in the car to run a normal airpump for air.
The biggest issue with transporting fish in a car is over heating. Cars heat up and the water can warm up pretty quickly. If you have a long way to travel, have the car's air conditioner on while transporting the fish. It will stop the interior of the car getting hot and cooking the fish.