I’m not sure they’ve been around long enough to know if they’re BIFL. I bought some Stasher and I bought another brand set at Costco. The Stasher are better. Better sealing and more options for shapes and functions. I love the ability to microwave, boil, refrigerate or freeze in them as well as dry storage. Dishwasher safe. Great for travel stuff outside the kitchen. I do feel like I’m getting my money’s worth and I cut waaaaaay back on disposable plastic (I still will use for a few use cases). So they are a bit pricey but I’m 18 months in and no regrets.