Look for 3 days tours including hotels from Chengdu to Jiuzhaigou.

Oh, you can turn to the website you are visiting if you want to look for such a tour. I had planned my travel through TravelChinaGuide, and the experience is superb. Their contact info is traveltravelchinaguide.com. Have a try.

After your arrival at the airport, you can deposit your luggage in T1: Between Gate 6 and 7 in Departure Hall or T2: Behind the Check-in Counter N, P separately.

There are different sized lockers, and the price is also different.
Small Locker (45×45×65cm): CNY 8 for 0-6 hours, CNY13 for 0-12 hours and CNY18 for 0-24 hours

Medium Locker (45×91×65cm): CNY 12 for 0-6 hours, CNY20 for 0-12 hours and CNY28 for 0-24 hours

Large Locker (45×91×95 cm): CNY 20 for 0-6 hours, CNY30 for 0-12 hours and CNY40 for 0-24 hours

If your storing hours are over 24 hours, every 6 hours will charge an extra fee CNY2, CNY4, CNY5 respectively.