Tenkara rods collapse into a small enough package to carry. And no reel is needed so weight will be minimal. Maybe take a look at them.

I have a 7.5 foot G.Loomis 4 weight rod I build for small stream work. Packs easily and will handle anything I encounter. Several makers produce 5 piece rods for travel that would be suitable for your purpose. Take a look around a good fly shop will let you take one outside and try casting. Shop around.