I would suggest this - if it's not too expensive. It comes flatpack and you put it together - the bar panels fix together with the edge pieces. It's a good cage. Maybe a bit bigger than you want though. It comes apart again for transporting.
https://www.amazon.co.uk/Ferplast-57...76%3A419158031
Or this - costs slightly more but is slightly more compact as well. It's about the same size as my Ted cage. Again the top nests in the base for travelling.
https://www.amazon.co.uk/Ferplast-Du...rds=duna+multy
Suggest getting an 8" Trixie wheel as well which will fit in either - you can always keep it for out of cage playtime in future and it's not expensive.
https://www.amazon.co.uk/Trixie-Exer...xie+20cm+wheel
You will also need a pet carrier if you don't have one. The Hamster can't travel in the cage - it's not safe - if you had to break they would fly across the cage and hit the side and everything would come crashing down.
I put the unassembled cage in the back of the car and inside it I put the bagged up bedding and toys etc (so old bedding and some new). Then the hamster in the pet carrier with lots of bedding and a little house and some cucumber and bits of food and treats.
I have the pet carrier on my knee (as a passenger) with a blanket over the top so it's dark. If you're the driver you could wedge the pet carrier behind a seat on the floor if it's well wedged in and can't move.
This one is good
https://www.amazon.co.uk/Ferplast-Al...carrier+medium
The advantage of the Criceti cage is it comes with a shelf - they like a shelf to feel safe. The advantage of the duna multy is it's more compact. And a large shoe box house would do instead of a shelf.
For a hide - a shoebox will do. Cut the base out and a hole in one side for a door and keep the lid as a lift off roof so you can check inside. Do take a few familiar toys though it helps them settle to have familiar smelling things in it and the same food bowl etc.