How much is 15kg of luggage? 15kg is a tightly packed 45L backpack.
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Medium-sized suitcases have a height of around 69cm. These suitcases are ideal for a week trip to Spain, or wherever you want to go to. The suitcases have a capacity of about 51 to 75L, which equals to about 10 to 15kg of luggage.
No matter how well-designed the backpack, less weight is always better. Use the bathroom scale to check that a pack isn't over 10% to 20% of your child's body weight. For example, a child who weighs 80 pounds shouldn't carry a backpack that weighs more than 8 to 16 pounds.
If you will potentially need that extra capacity on a future trip, then definitely get the 75L pack. If you're doing it just because it doesn't seem like much extra weight, even if you don't expect to ever need it, I would go for the 65L pack. That would also curb the temptation to overpack.
A 50L+ backpack is a great friend to those travelling for a few weeks. These bags are spacious and can accommodate a number of outfit changes before you ever have to visit a laundromat. But don't be tempted to fill your pack to its capacity before you've even left - remember to save space for souvenirs!