The Founders of a Clothing Rental App Talk Sustainability and Fashion Essentials

Ground Up Nut Butter Almond Cashew Coconut Chunky ($20)

"A couple jars of these are always in my pantry," Gross says. "The flavors are unique and so delicious. A bonus is that they also come in squeeze packs that are great for throwing into my book tote. An even bigger bonus is that the brand is woman-owned, and they have an employee training program for women overcoming adversity. Extra extra is that they reuse the glass jars the butter comes in when you ship them back. Win, win, win."

Ground Up offers an abundance of unique flavors to satisfy your palate, and the mixture is vegan, unsweetened, and peanut- and wheat-free.

Nars Afterglow Lip Balm ($28)

This moisturizing balm has a blend of antioxidants to help condition and protect lips, and Gross is a big fan. "It's so lush and silky on my lips and helps keep them hydrated year round. I also love that it comes in different hues to add just enough color," she says. While this popular shade, Orgasm, is described as a sheer peachy-pink with golden shimmer, there are eight other tones to try it in.

S'well Stainless Steel Water Bottle ($29)

"I always have one full any time I leave the house," Gross says of S'well's BPA-free water bottles. "I just cannot bring myself to buy bottled water anymore. I love that this is indestructible, keeps my water cold, and contains no plastic."

This 17-ounce bottle has triple-layered insulation that keeps beverages cold for 36 hours and hot for 18. Another perk? The opening at the top is wide enough for most ice cubes and the bottom fits into the majority of car cupholders.

Aesop Resurrection Aromatique Hand Balm ($33)

Giese describes this Aesop hand balm as "so luxurious feeling; not sticky or greasy." The formula works to restore and soften skin and cuticles while protecting hands from harsh weather, frequent handwashing, or anything that may dry them out. "The tube makes me think of an old-time apothecary," she notes.

Studio Lagree Drop-in Class ($35)

Giese describes Studio Lagree as "hands down my favorite workout." The studio concept fitness class combines core, endurance, cardio, balance, strength, and flexibility work to make for a no-impact workout that's designed to be performed slowly. Everything is done on an M3 Megaformer machine, and there are currently five US locations. If you're into the idea, but not near a studio, check out Solidcore for similar movement and routines.

Nike Air Max 90 ($130)

"I am on my third pair of these sneakers!" Giese says. "They are easy, go with everything, and are by far the most comfortable sneakers I have worn. I love to walk - I will frequently take a 30-45 minute walk midday to reset - and these are my go-to. They've been part of many of my airport outfits and travels, too."

This model is crafted from sustainable materials and is available in eight different colorways — or you can customize your own unique design on the brand's website.

Loewe Anagram Mohair-Blend Cardigan ($1,700)

Gross always has a favorite cardigan that she wears year-round on repeat. "I wear them to layer through the winter or during a chilly spring morning walk," she says. "They're easy to throw on over shoulders and can very simply be dressed up or down." While this Loewe design is certainly an investment, it comes with the brand's signature logo detailing on the front pockets and at the back that take it to the next level, as far as craftsmanship is concerned.

Goyard Saint Louis PM Tote Bag ($2,200)

"I was skeptical about this tote, then a friend let me borrow it for a European vacation (sharing!) and I was hooked," Giese says. "It held SO many things: laptop, hardcover book, sweater, and everything I needed for a long haul flight with my 10-year-old son. I had Violet buy me one because she was going to Paris shortly after. It's unstructured but still structured, which doesn't make sense to me but it works. It folds and doesn't hold the creases, which always blows my mind. Bonus: you can lend it on Tulerie and make money back!" The version linked here is part of FWRD's Renew program and comes with the original dust bag, brand box, and authenticity card.

Gross's pick, meanwhile, is the Dior Toile De Jouy Book Tote Bag ($2,600), which is also available via FWRD Renew. She describes it as "similar to Diana's love of the Goyard, but with structure," explaining, "I love all my bags to have structure. This bag fits anything - computers, books, snacks, water, clothes. It's so versatile and easy, I just love it and use it constantly."

Sarah Wasilak (she/her) is the associate director of Shopping at PS. With plenty of experience in the commerce market, a keen interest in SEO, and 10 years as an editor at the brand, she enjoys writing across the lifestyle and health-and-fitness categories. She has bylines at PS, InStyle, Elle, Refinery29, Who What Wear, Elite Daily, Byrdie, and The Quality Edit and aims to amplify minority voices in all her work.