I am curious as to just HOW big this bag is... I am debating between this and the half mass. Will be using as a carry-on for business travel for myself and my boss as well as everyday business/meeting work.

This bag is pretty dang big. The geniuses at Timbuk2 have developed an objective measurement system called TPRCV, or toilet-paper roll capacity value. Their large classic messenger bag is similar in size, and can hold 16 toilet paper rolls.

Here's their explanation:

What is TPRCV?

We know you don't have time to buy the wrong size bag. We also know you're imaginative and visually oriented problem solvers living in a three dimensional world where toilet paper is routinely available.

Soft, stackable and building block-like, toilet paper rolls can be easily arranged to simulate the internal dimensions of any bag.

Working in tandem with our R&D department, our marketing team recently completed an assessment of each bag. We have identified, down to the roll, the maximum capacity for each bag we tested. The resulting TPRCV (Toilet Paper Roll Capacity Value) can be used in a simple, at-home comparison of corresponding stacks of TPR, helping you make an informed decision about what size bag best suits your purposes.

You will need a flat, level surface, a maximum of twenty-one toilet paper rolls (TPRs), your imagination, and your design and rendering skills.

For best results, use two-ply.

http://www.timbuk2.com/tb2/products/messenger/classic-ballistic-messenger/size/7/

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