Petite Keep

Petite Keep makes personalized keepsake trunks designed to store and display a family's most meaningful items, from a child's first outfit to letters and small heirlooms, in a piece that looks like furniture rather than a plastic bin. Founder Lindsay Mullenger, a University of Missouri graduate, built the brand around the idea that the things we save deserve somewhere beautiful to live. The trunks come in several sizes and can be customized, turning ordinary storage into something families want to keep on display.

On Shark Tank Season 16, Mullenger asked for $400,000 for just 5 percent of the business, a low offer that signaled real confidence backed by fast-growing sales. The pitch resonated with the panel, and she ended up making a deal with Barbara Corcoran, Mark Cuban, and guest shark Jamie Kern Lima for $400,000 in exchange for 15 percent. The combination of an emotional product and serious revenue made the negotiation a friendly one.

Petite Keep stood out because it married sentiment with strong numbers, a rare pairing in the Tank. Many products lean on either a heartfelt story or hard sales, while Mullenger had both, presenting a brand that had scaled quickly without losing its personal feel. That balance, plus a clear sense of who buys the trunks and why, made the company easy for the sharks to believe in.

The Shark Tank spotlight added to momentum the brand had already been building for years, drawing new customers to its trunks. Petite Keep had grown its sales sharply over several years before the episode, and the national audience helped introduce the keepsake trunk concept to shoppers who had never seen storage presented as something heirloom-quality.

As of 2026 Petite Keep is still operating and has kept expanding its catalog since the show. The company has introduced new trunk styles and quicker-shipping options along with coordinating accessories, and has run collaborations to widen its appeal. The brand continues to sell directly through its website with a focus on personalization.