Cart/Basket system for buying many items at once

I cannot currently see a way to purchase multiple items at once from creators in a single transaction. They usually have to make "packs" with a discount to make things a little simpler. Having a basket and allowing people to make a purchase all at once could increase upsells because people like me want to buy a bunch of things at once (usually during a promotion or to get a jumpstart on an avatar with a kit), and reduce fees for sellers and Jinxxy because they'd only be paying them for a single transaction for multiple items in a single purchase since often a big chunk of fees can be the minimum transaction fees. I'm not sure why this isn't a feature yet.