In the product details says it fits a 17" laptop but when I add it to the shopping cart it says it fit 15.6" laptop, which is the correct one ?

It can hold a 17-inch laptop, which is no problem.

does this have a waist strap?

yes,This travel bag has a waist strap

Can I use it as my personal item on a plane? I mean, would it fit under the sit?

Yes, no problem. It can take the plane and put it on the rack or near your seat. Its maximum size is 21.6*12.6*10 inch. It just looks big. In fact, its interior space is spacious.

Item Package Dimensions L x W x H	14.17 x 10.43 x 6.5 inches
Package Weight	1.74 Kilograms
Item Dimensions LxWxH	6.7 x 12 x 20.5 inches
Item Weight	3.68 Pounds
Brand Name	KAKA
Color	Black 35l
Material	Polyester
Suggested Users	unisex-adult
Number of Items	1
Manufacturer	KAKA
Part Number	2070
Style	Water Resistant, Anti-theft, Convertible, Laptop Compartment, Breathable, Bottle Holder,sctatch Resistant, Adjustable
Outer Material	Nylon
Size	20.5inch
Sport Type	Climbing, Hiking, Mountaineering
Age Range Description	Kid
Units	1 Count
Capacity Total	35 Liters

KAKA Travel Backpack, Carry On Backpack Durable Convertible Duffle Bag Fit for 15.6 Inch Laptop for Men and Women(Medium 35L)

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