Unless you’ve been OOO for the past 24 hours with your phone on DND mode, you’re probably aware that it’s Prime Day. And you likely know that this year the event is four days instead of two. The sheer volume of sales is enough to make your head spin, and the extended time window probably has you wondering if the deals are changing each day.

These little purchases offer big benefits, including tumbler upgrades, sunscreen restocks & viral skincare products on limited sale at Amazon.

If you’re a Prime member, you can save up to $100 on the waterproof e-readers.