If you’re an urban dweller, a student, or a backpacker—basically someone who lugs around a lot of stuff throughout the day—deciding what is worthy to make it out of the house with you can require some tenacity, planning, and resourcefulness. Unfortunately, one of the things that often doesn’t make the cut is a reusable water bottle. Many are (understandably) hard, durable plastic or aluminum, but these take up a lot of space and can be heavy, even without water. With convenience and time, it often seems easiest to just buy a PET bottle on the go.

A new bottle released this past year, the Vapur, is a smart and easy solution to this problem. Termed the ‘anti-bottle,’ the Vapur is a 16 oz, flexible, rollable, foldable bottle. When filled, the tough, (BPA-free) polymer bag-bottle stands upright, and flattens to roll or fold up when empty. The colored bottles (green, blue, pink, and smoke) have a standard pop-top spout, and are conveniently freezer and dishwasher safe. It also comes with a detachable carabiner, for easily attaching to belt loops and backpacks.

Additionally, the Vapur folks created the packaging from recycled paperboard, printed with soy ink, using wind power for the printing process. The manufacturing is done in the U.S., is lightweight and ships flat, and one truck full of Vapur bottles is equal to 9 trucks full of rigid water bottles. It’s colorful and convenient, but it’s also not the first flexible water bottle on the market.

The Platypus, another flexible (again, BPA-free) “nylon/polyethylene film” bag-bottle, has been around for years, directed at the outdoor and exercise crowd, making for naturally more rugged considerations. It also has a standard pop-top spout, but also boasts an all-natural, silver-ion-based SlimeGuard™ antimicrobial film to stave off bacteria. It can withstand freezing to boiling temps, but it’s not recommended for dishwashers. The Platypus also has a reinforced loop for attaching to a belt or rope, and comes in several size options, from .5 L to 2 L. It’s collapsibility makes it 80% lighter and more compact than an empty hard bottle of equal volume.

Both bag-bottles make for a great solution to the overloaded bag problem, providing a lightweight, unobtrusive vessel for the H20 we all could use throughout the day.