Get total weight of the cart in Magento2

in order to get the total weight of the cart you can use two main methods, we will list them here 

First Method 

$weight = {getQuote()}
              ->getShippingAddress()
              ->getWeight();

Second method 

$items = {getQuote()}->getAllItems();

$weight = 0;
foreach($items as $item) {
    $weight += ($item->getWeight() * $item->getQty()) ;
}

echo $weight;