It would have to:
- Be soft enough to fold into uncomfortable spaces
- Have enough pockets for segregation of stuff (one big hole will not do)
- Boast outside pocket for at least one water bottle
- Include a "gum sack" for quick access
- Until I switch to an iPad, accommodate (and cushion) my laptop
And actually I have all that in my trusty, well-traveled Swiss Gear back pack. But it doesn't roll. And it's pretty heavy. So another requirement:
- Ability to levitate
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