@Jessica89 your duckling is adorable! I don't recall what your setup will be when you introduce the new duckie, so bear with me if this is not feasible or a big DUH. After our 2 outgrew their tote, we put them in a large dog kennel, the kind that's wire only. It's meant for puppies that still have growing to do, so it came with a divider. If you have a similar kennel, it may work? (Btw, I will be putting some kind of barrier around the bottom 3-4in next time. Keep shavings, feet and beaks IN the vehicle at all times during the ride!!)
I'm putzing around the kitchen and just saw a cooling rack that's the same size as 1/4in hardware cloth. Maybe something like that would work as a divider you could slide into the tote, box, what have you? Maybe the door off of a plastic dog kennel, artfully placed.....? The clear lid to a smaller tote? As I'm looking around, more household stuff starts to take on new appearances! I feel the full blown crazy duck lady starting to seep through my pores! Lol
Again, adorable little duckie!!!