The Lupulin Exchange is a marketplace facilitator (aka platform (ie Kayak, eBay, Uber, etc.)). LEx doesn’t sell hops; it’s just a busy marketplace where a community of buyers & sellers connect. Since every transaction on The Exchange is between 1 buyer & 1 seller, it's not possible to combine listings with different sellers or storage locations into a single cart/transaction. However, it is possible to combine multiple listings with the same seller & storage location into a single cart/order/shipment.
Here’s how it works… Let’s say you want to checkout a box from this listing:
After you click the Checkout button, you’ll see the Bundle & Save! section, which shows you a bunch of other listings from the same seller:
Notice the shopping cart icon (see header) in the images above & below. In this case, the seller is Yakima Chief Hops. We can’t fit all of their other listings on this page, so if you click Continue Browsing!, that will take you to the listings page, filtered by listings for which the seller = Yakima Chief Hops:
If you find another listing that you want to add to your existing cart, just click Add to Checkout:
Now your cart has 2 items. Hover over the shopping cart icon to see what’s in your cart:
Repeat that process as much as you’d like, then complete the checkout. If you view a listing from a different seller before completing the checkout, you’ll see a Create New Checkout button with a warning that the listing cannot be added to your existing cart:
If you click the Create New Checkout button, your existing cart will be emptied and you’ll start over with a new cart, containing only the Chinook from Flathead Valley Hops.
TL;DR: No single transaction on The Exchange can have > 1 buyer, seller, or storage location. As long as those conditions are met, you can bundle an unlimited number of listings into 1 cart/order/shipment.
And one last thing: it’s called Bundle & Save because in some cases, bundling will result in significant shipping cost savings. For example, in most cases, the cost to ship 11 lbs of hops is only slightly less than the cost to ship 44 lbs of hops.