Cart reservation only works if you have items that are in stock in your cart and wish to add an out of stock item to it (to combine orders, reduce shipping cost etc).
Please contact us before reserving a cart, as we can confirm the ETA of the out of stock items.
Generally what we suggest to reserve your cart (after we have confirm the ETA of the out of stock items/you confirm you're willing to wait): is to place an order for the current in stock items to reserve it. We won't ship your order out until the products you are waiting on arrive, and when they do we'll let you know and generate an invoice (that way we can exclude/deduct shipping fees that have been paid, as the order is combined).
Unfortunately there are particular brands that we WILL not be able to reserve, due to the high demand for them:
Glossier
Krave Beauty
Peach and Lily
If you are interested in reserving your current cart, please contact us here.