I had thought about getting something like this for my toddler for the same purpose.
Columbia Snuggly Bunny Down Bunting
Comes in 24mo size
We also have a Phil & Ted portable crib that is nice since it has an insulated self-inflating mattress. The top zips off too. Not sure this would be worth it to you since your toddler will be growing out of it soon. We've used it to travel with the idea it would give him the same familiar sleeping quarters everywhere he was. It actually has worked well for us.
98 Lexus LX470
85 Land Cruiser BJ70
09 KK SportsRV