Shipping Costs

Why does it cost 35$ to ship to Canada, when it costs a maximum of 25$ to ship to the middle of the Pacific? I would like to buy a bag just a simple medium messenger with a laptop insert, but by the time its at my door step it'll cost an additional 55$ at least, I understand that the duty and taxes are unavoidable, why not just jam it into a tiny box and ship it out for cheap. I've shipped quite a few things to the states that are a lot heavier and larger then a bag and gotten 300$ insurance on it and only paid 25-30$ for the shipping, wouldn't you also be receiving a quantity discount since you are business and ship out I am assuming quite a few orders? Sorry for the rant but I am at a loss as to why the price is at what it is.