Backpack As Goodie Bags What Kind Of Backpack Is The Best To Use As A Carry On In An Airplane?

What kind of backpack is the best to use as a carry on in an airplane? - backpack as goodie bags

Hello,
This summer I am in Thailand for 10 days. I have a suitcase and hand luggage. I wanted a sort of adidas bag for checked luggage, and I wanted a backpack for my green light. What are the best things they buy?