The capacity is 41.5 Litres to the brim of the backpack, plus anything else you can strap, fasten or wedge in there . You can fit a case of 24 / 375 ml glass bottles in easily and comfortably, still leaving space for jacket, manifest, water bottle and stuff.

Features include 1680D Ballistic nylon base, quadruple layer boot, triple layer
construction. External layer is 1000D Duracord with a 430 GSM weight instead of the 360 GSM of Cordura. This means it is stiffer, heavier and tougher. It is Teflon coated on the outside and PU coated on the inside.

The middle layer is like truck tarp only thinner (650 PVC) and has a tearstop weave throughout. This is the one piece water resistant layer.

For the inside we have used a 300D nylon which is a light weight material for a
plush finish it also stops plastic bags from gripping when it is a tight fit, as can happen when a PVC is used as a liner.

Exterior colours are: Black, Navy, Grey and Auscam. There is a wide choice of
liner colours. Fluoro Orange, Fluoro Yellow, Black, Royal Blue, Deep Blue, Red, Olive, Grey, Silver and Purple. The Velcro colour choices are Black, Red, Royal Blue, Fluoro Yellow, Fluoro Orange, Fluoro Green, Fluoro Pink, White, Navy and Grey.

External, PVC lined, 3D pocket for tool kit, pump or whatever, this has a side wall so no space is lost from the internal part of the main bag.

Sandwich Velcro on the strap for mounting phone pouches or radio holders
without having to thread them onto the strap.

Padded mesh on the inside of all pads to absorb sweat and 10 mm high density
foam for all pads too, nice and comfortable. All the padded straps are removable so you can wash them (not in the washing machine), yes the compression straps come off too. The back padding is on the outside and is removable so you can wash it also.

The shoulder straps and sternum strap has a quick release system, most professional courier bags use this system. The shoulder straps are an ergo shape for a more comfortable fit.

There is a combination of maneuvers that allows you to access the backpack without having to take it off.

There is a 50 mm stabalising waist strap which is removable. The shoulder straps use a 38 mm Swivel buckle with a button release. The perfect angle can always be achieved so the load is spread equally across the strap. There is a combination of maneuvers that allows you to access the backpack without having to take it off.

Inside there are two water bottle pockets, one on each side of the zip up pocket.
This fits inside another pocket that is slightly bigger so you get two pockets in the same space, one of which zips up for valuables. The zip pocket has a high visibility liner  so you can seen the contents of the pocket in poor light.

The flap straps are 100 mm longer than most of the other bags out there. These straps also have a large 'T' sewn into the end so that they don't get sucked through the buckle and are easier to grab and pull. This system also prevents snagging on passing vehicles.
This doesn't mean that they won't get caught in your rear wheel, so be smart about your excess, there are many places to fasten it. The 4 side compression straps are removable.
Light tabs on the flap and on the bottom also for when the bag is full. The light tab on the flap can fit a D-lock (specific to Krypto evolution or minis).

The logo on the light tab is Velcro backed with hook so it can be removed and placed around the bag.

2 metres of 6 mm shockcord with friction binding to rig up boxes to the outside of the bag so you can still get inside your bag without having to take the box out first. (You know when you have 3 jobs and the box is the first to pick up and the last to drop).

Two tube holders (these are load tested to 40kgs each, not that you would want to put that to the test), four D rings for hanging stuff off like a pump or a jacket. The bottom two D-rings are located so you can thread the excess of the flap straps in. Six anchor points to thread the shockcord or tube holders through, two of which are on the flap buckles. They are shaped so that they are easy to thread when bent back but are unlikely to snag on things like trucks when you brush up against them.

The Velcro on the flap is two separate pieces so there is a total of 75 mm  in width. If you don't want to use the buckles on the flap 75 mm of Velcro holds well (again, tidy up the excess of the flap straps). The flap Velcro runs at 90 degrees to the bag Velcro so you are more likely to catch it if you are changing the flap position. All Velcro has a reinforcing rows of stitching.

This backpack is simple in it's lay out whilst tech enough to do the job properly. This is NOT a fashion item. This bag is designed for courier work by a courier.

The backpack is an alternative for people who want a more even load distribution. They are also more comfortable to stand and walk with than a single strap courier bag which is tailored to the cycling position. They also anatomically suit women better than a single strap courier bag.

This is the complete package, there is only one spec. There is
only one size so far. The backpack mini is on it's way.

All bags are made to order. There is currently a four week waiting list for this product.