Do you mean your Watch List? That is here:
https://www.ebay.com/mye/myebay/watchlist
If you have other custom lists, you can reach those through your Watch List page if you use a desktop browser and click on the large Watchlist heading at the top to reveal a drop-down menu of your lists.
You can see items you have recently viewed here:
https://www.ebay.com/mye/myebay/rvi
Items that were in your cart that you have saved for later should appear at the bottom of the cart page:
https://cart.ebay.com/
