Suggestions needed for a collapsible carry-on bag

[Dis703]

I'm going to be flying 2 different airlines for our upcoming trip. The flight to Orlando I can take carry on without any extra fees but the flight home I have to pay $30 for carry on.

Since our initial plan was to fly Frontier with no bags (meaning taking only what we can fit under the seat in a backpack and diaper bag) we were planning on ordering groceries for delivery. But that's a pricey way to do it for only 2 of us for 3 nights. So now I'm thinking I'd like to take an extra carry on with snacks and breakfast foods instead of doing a grocery order. But I don't want to fly home with the extra bag and have to pay the fee.

I'm trying to find a bag that is sturdy but lightweight and folds up small enough to stuff into another bag without taking up too much space.

Any thoughts or suggestions on a bag that might work well?

TIA!

 

[Dashzap]

Any zip up nylon duffle should do the job.

 

[Clifton Tesh]

Look up mcirco bags on amazon.

 

[bob_bldr]

We had a split stay in February 2015 and transferred groceries using 2 Rachael Rae Chill Totes bought on Amazon for $20 each. They folded flat in our luggage, have some insulation and the lining held ice well and was easy to wipe down.