I too have a climber. I tried the nylon expen & he chewed through it. Poor baby was so traumatized & wet from saliva when I got home that I felt horrible
I ended up keeping him in the kitchen & purchased an extra tall gate that has horizontal bars so that he wouldn't be able to get enough traction to climb up. Unfortunately, my crazy puppy figured out the perfect distance to run & jump to a height on the gate that he would be able to climb over. I now leave his toy box in front of the gate so that he won't be able to run & jump to get over. I leave a sticky yoga mat under the plastic toy box so that he can't move the box. He's moved the box before. Fortunately, the toy box (a plastic under the bed storage box without a cover) is the exact length of the door opening where the gate is. So far, he hasn't been able to get out with that set up. But I'm pretty sure he'll learn how to bypass the toy box one of these days.
If I know that I'll be gone longer than 2 hours, I put 2 dining room chairs against the other side of the gate - with the chair backs facing the gate. That way, even if he manages to bypass the toy box & jump and climb to the actual gate, he won't be able to get over the gate because the chair backs are in the way. I also put a 20 pound dumbbell on each chair so that he can't move the chairs.
Now that I've actually written this down, I can't believe that I go through all this trouble!!? But I have 2 puppies & they fight sometimes. So I'm still afraid to leave them alone together when I'm away for over an hour.
I'm going to keep watching this post. I would love to be able to find an easier alternative
