PET Underground Daypack laptop pocket small

I bought a PET Underground Daypack. My Dell Latitude D630 fit very very tight in it. How come it is tight like that? According to the spec my laptop should fit nicely. I am planning to return the bag since I am struggling each time I need to put or take out my laptop. Size of the laptop is 13.5x10 (with small wriste rest attach to the battery)
 
sad I’m frustrated
Inappropriate?
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