I have added their J-Strap for the roll top, which makes it easy to hold large items on top. Shipping included for CONUS.
From their website: (and they have more details there)
Designed for hikers pushing their limits and obsessing over every gram. The ultralight Nero is a compact frameless backpack streamlined to only the most essential features making it great for hikes where less weight and volume is required.
Multiple thru-hikes of the Triple Crown trails have been completed with the Nero, helping to prove that smaller volume frameless packs are a legitimate approach to long-distance hiking.
Featuring a removable webbing belt, sit pad, and a variety of optional modular add-ons, the highly versatile Nero will allow you to get the most out of any day, section, or thru-hike.
Pack Weight: 10.9 ounces (308 g) | Foam sit pad adds 1.0 oz (28 g)
Belt (included): 1″ (2.5 cm) wide x 50″ (127 cm) circumference, 1.2 oz (34 g)
Body dimensions: 5.5″ x 12″ x 23″ (14 cm x 30 cm x 59 cm)
Volume: 38L (25L main body, 2.5L each side pocket, 8L center pocket)
Load Capacity: Recommended up to 20 lbs (9 kg)
This backpack has three belt attachment positions allowing you to move the belt up or down to fit a range of torso heights. The actual distance on the pack from the bottom of the belt to the top of the shoulder straps can be adjusted from about 18″ to 22″ (46 to 56 cm), which will fit most adults. On a frameless backpack, it is nice to have the shoulder straps roughly level with the tops of your shoulders (rather than wrapping up around them) so that more weight is forced on to the webbing belt. The pack body does not extend much above your shoulders and load lifter straps are not needed.
The webbing belt will fit up to around 50″ circumference and can be trimmed down for smaller waists or swapped out for larger waists. To move the belt to a different position, slide off the belt buckle and back the webbing out of the backpack attachment points.