You have only specified two dimensions. You need a third dimension to calculate volume, along with shape.
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83.12 gallons
a gallon is 231 cubic inches, so: 36x16x6.5 / 231 = 16.2 gallons
4 gallons
The container has a volume of 4160 cubic inches (26x16x10). Assuming you are talking about gallons of water, it will hold 18 gallons (231 cu in per gallon).
16 US gallons = 60 liters 16 UK gallons = 72 liters