Search for Toddler Backpack with Safety Harness Leash
https://www.amazon.com/Upgraded-Insulated-Toddler-Backpack-Harness/dp/B00WO92FE4/ref=sr_1_1_sspa?ie=UTF8&qid=1513272982&sr=8-1-spons&keywords=toddler%2Bbackpack%2Bwith%2Bleash&th=1
https://www.amazon.com/Brica-My-Side-Safety-Harness-Backpack/dp/B00B7M7BMA/ref=sr_1_3_a_it?ie=UTF8&qid=1513272982&sr=8-3&keywords=toddler+backpack+with+leash
https://www.amazon.com/Skip-Hop-Toddler-Harness-Backpack/dp/B009YDCH2S/ref=sr_1_6_a_it?ie=UTF8&qid=1513272982&sr=8-6&keywords=toddler+backpack+with+leash