The two siblings both wore matching red flannel shirts, acid wash jeans and edgy black boots, holding hands as they strolled side by side.
Both Khloé and Kylie appeared relaxed and comfortable as they shopped around the store with their family, proving there's nothing that can break their sisterly bond as they enjoyed a bit of quality time together.
The 29-year-old E! star also Instagrammed a photo from their outing, captioning the adorable pic, "Kylie and Khloe take Kostco #Flannel#Sisters#BFF"
After spending a bit of quality time with her family, Kylie (and presumably Khloé) hung out with French Montana. The 16-year-old Keeping Up With the Kardashians star Instagrammed a photo with the rapper in what appears to be a recording studio where the twosome are showing off their dance moves.
"@frenchmontana," she simply captioned the pic in which she's sporting a black-and-white striped shirt, gold jewelry and black pants.
Kylie posted the Instagram pic just one day after Khloé and French were spotted on a dinner date in Hollywood.
Joined by a male pal, the 29-year-old Keeping Up With the Kardashians star and the music producer were photographed hitting up Casa Vega Mexican restaurant, where an onlooker described the group's behavior as "very friendly."
Khloé and French recently enjoyed a weekend getaway to New York together. The duo was spotted enjoying a three-hour-long lobster dinner together at an eatery by the beach.
Prior to their trip, the duo stepped out for dinner in L.A. several nights in a row and the pair seems to be getting along well. "Khloé adores him," a source told E! News at the time. "She keeps telling everyone what a great guy he is."
And apparently, Kylie agrees!