If you plan on in bulk (buying multiple items) listed by the same seller, it is possible to do so in one trade, instead of having to buy the items individually. If you for instance wish to buy cases or stickers, this comes in handy, as you avoid the limit on Steam of maximum of 5 active tradeoffers with the same user 💼

In order to do so, you need to go to the seller's shop and select the items from here. If you select the items directly from the marketplace, it is not possible. You can navigate to a seller's shop by selecting an item and pressing on the seller's image below the item screenshot 🏪