The Adjustable Bag from Kickstarter! I got it two weeks ago and I use it every day for different activities. It’s for all practical purposes; collapse and expand with 3 sizes and 10 configurations from your daypack to a week vacation. 
The specification is here below:
A10 – BLACK RIPSTOP NYLON
With 3 sizes and 10 configurations, The Adjustable Bag is the world’s most versatile convertible bag. It can instantly expand or contract to fit exactly what you need so that you’ll never have to go through the hassle of switching between different bags again.
Depending on your activity or occasion, The Adjustable Bag can transition between 31L, 46.5L, and a 62L capacity, allowing it to be your day, weekend, or travel bag all in one. There’s never been a bag with so much versatility.
The Adjustable Bag can also be completely collapsed into a small ball so that you can easily store it or take it with you wherever you go.
SPECS
- Capacity – 31L, 46.6L, 62L
- Collapsed, Duffel, Sling, Backpack
- Day, Weekend, Travel bag – all in one
- Removable straps for streamline shipping
- Water-resistant
- 1 exterior quick access zip pocket, 2 interior hidden pockets
- Lengthwise opening for easy access
- Lockable main compartment zipper
- 2 padded backpack straps + 1 padded shoulder strap included
SIZES
- Small / 31x31x41cm
- Medium / 31x31x61.5 cm
- Large / 31x31x82 cm
- 1KG, 2.2 Pounds
MATERIALS
- PU treated water-resistant ripstop nylon
- 210D polyester lining
- Extremely light and durable Duraflex ABS hardware
- Waterproof SBS zippers
More info: https://www.piorama.co
