You can use them in the microwave without removing the lid.
Brad's Deals Editor Marisa,
This Rubbermaid Brilliance 18pc Food Storage Set drops from $29.99 to $19.98 at Walmart.com. This is the lowest price we could find on any Rubbermaid Brilliance set, and this same one is $30 at Amazon (check out the reviews). They're made of thicker BPA-free Tritan plastic. Spend $35 to get free shipping, otherwise it adds $5.99. Sales tax is charged in most states.