First of all, we must first confirm the use of backpack object age stage,
Second, to confirm the shoulder under the package made the function,
Third, to sort out some of their own custom requirements,
Fourth, to confirm the number of backpacking;
Fifth, to confirm the budget price of the backpack;
Sixth, to confirm the latest delivery time for the backpack.
To determine the above elements of these custom, the next step is to measure a suitable backpack factory.