Carry Case

What are the best mechanical properties for a carry case?

I am to design a carry case for electrical equipment using CES edupack 2011. I am to Select materials and process methods to make a light travel case for electrical equipment (two models – cheap; and up-market, high quality, minimum weight ones).

So far, I think what is important is;
Hardness,
Compressive strength,
poor conductor,
good insulator,
materials that can be shaped using casting or moulding.
and then arranged by price/density.

I am getting stupid things such as glass. So maybe add tensile strength. I am only getting ceramics as choices, I know cases would probably be made out of tough plastics or metals. What properties am I missing?

Cost, weight, ease of shaping/manufacture.

Note that it is weight of a case rather than density of material.

Big Wilson Carry Case from Chuggington Fits 17 diecast trains Disney Learning Curve

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Everydaysource Red with Keep Calm And Carry OnQuote Silicone Skin Case compatible with Apple iPod touch 4th Gen $1.26 1X Silicone Skin Case compatible with Apple® iPod touch® 4th Gen, Red with “Keep Calm And Carry On”QuoteKeep your Apple® iPod touch® 4th Gen safe and protected in style with this silicone skin caseSlip your iPod touch® 4th Gen in to add a splash of color and deliver instant all around protection from scratchesConstructed from smooth, treated silicone that resists dirt and stainsProvides easy …

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Fintie (Black) Folio Book Style Carry Case For Amazon Kindle Paperwhite with Auto Sleep/Wake Feature 8 Colors Options $5.99 …

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Fintie (Red) Folio Book Style Carry Case For Amazon Kindle Paperwhite with Auto Sleep/Wake Feature 8 Colors Options (does not fit Kindle or Kindle Touch) $5.99 …

Vera Bradley Carry It All Wristlet $38.00 Use the adjustable wrist strap to carry as a handbag or a wristlet, or attach it to the handle of a larger bag…

Alpine Swiss Rolling Briefcase on Wheels Good for Sample, Catalog, Pilot, Attache Case Lawyer’s Briefcase Legal Size Laptop Case Sleeve, Overnight Bag Carry on Luggage w/ 1 Year Mfg’s Warranty $57.99 Made from the best possible materials and providing a great value. This briefcase is roomy, well designed and sturdy. Secured with two combination locks which can be set to separate codes it also featured a locking front compartment that expands. Inside flap features a basic organizer for pens and cards as well as a good size zippered pouch for other essentials. Large inside compartment features a…

Brother Hard Carrying Case $38.99 Brother Hard Carrying Case

Everki EKB424 Carrying Case (Briefcase) for 16 Notebook – Black $55.99 Everki EKB424 Carrying Case (Briefcase) for 16″ Notebook – Black

Everki EKP119 Carrying Case (Backpack) for 16 Notebook – Black $96.99 Everki EKP119 Carrying Case (Backpack) for 16″ Notebook – Black

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Power A Carrying Case $46.99 Power A Carrying Case

Everki Beacon EKP117NBKCT Carrying Case (Backpack) for 18 Notebook - $118.99 Everki Beacon EKP117NBKCT Carrying Case (Backpack) for 18″ Notebook – Black

Kensington Sky Runner Contour Carrying Case $71.58 Kensington Sky Runner Contour Carrying Case

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Everki Commute EKF808S17 Carrying Case (Sleeve) for 17 Notebook – Bl $35.49 Everki Commute EKF808S17 Carrying Case (Sleeve) for 17″ Notebook – Black

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PC Treasures SlipIt! 07626 Carrying Case for 17 Notebook – Purple $22.02 PC Treasures SlipIt! 07626 Carrying Case for 17″ Notebook – Purple

PC Treasures SlipIt! 07638 Carrying Case for 15 Notebook – Pink $21.99 PC Treasures SlipIt! 07638 Carrying Case for 15″ Notebook – Pink

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PC Treasures SlipIt! 07630 Carrying Case for 17 Notebook – Pink $22.49 PC Treasures SlipIt! 07630 Carrying Case for 17″ Notebook – Pink

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HP Carrying Case for Netbook $54.99 HP Carrying Case for Netbook

MANHATTAN Empire 421560 Carrying Case for 17 Notebook – Black $22.99 MANHATTAN Empire 421560 Carrying Case for 17″ Notebook – Black

Manhattan Empire II 421577 Carrying Case (Briefcase) for 15.6 Notebo $27.98 MANHATTAN Empire II 421577 Carrying Case for 15.6″ Notebook – Black

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Everki Titan EKP120 Carrying Case (Backpack) for 18.4 Notebook – Black $184.99 Everki Titan EKP120 Carrying Case (Backpack) for 18.4″ Notebook – Black

Ogio NEWT II MONO Carrying Case (Backpack) for 15 Notebook – Black $84.99 Ogio NEWT II MONO Carrying Case (Backpack) for 15″ Notebook – Black

Carrying Case for Presentation Easels $104.99 Carrying Case for Presentation EaselsFor Unimate (QRT100TE) and Ultima (QRT101EL) Easels, sold separately. Handles, full zipper.Black

Codi Carrying Case for Notebook $64.49 Codi Carrying Case for Notebook

Codi Carrying Case for Notebook $64.99 Codi Carrying Case for Notebook

PC Treasures SlipIt! 07628 Carrying Case for 17.3 Notebook – Navy $23 PC Treasures SlipIt! 07628 Carrying Case for 17.3″ Notebook – Navy

Samsonite Aramon NXT 43332-1373 Carrying Case for iPad – Magenta, Gra $21.35 Samsonite Aramon NXT 43332-1373 Carrying Case for iPad – Magenta, Grape

Looxcie Carrying Case for Camcorder – Black $9.09 Looxcie Carrying Case for Camcorder – Black

Targus Spruce EcoSmart TBM022US Carrying Case Tablet PC – Black, Gree $42.11 Targus Spruce EcoSmart TBM022US Carrying Case Tablet PC – Black, Green

Mobile Edge SlipSuit MESS7-16 Carrying Case (Sleeve) for 16 Notebook $31.49 Mobile Edge SlipSuit MESS7-16 Carrying Case for 16″ Notebook – Red

rOOCASE Deluxe RC-NHB10-BG10-DB Carrying Case for 11.6 Netbook – Dar $25.99 rOOCASE Deluxe RC-NHB10-BG10-DB Carrying Case for 11.6″ Netbook – Dark Blue

Mad Catz Fold-N-Hold PlayCase NOV197320N04/04/1 Carrying Case for Gam $19.99 Mad Catz Fold-N-Hold PlayCase NOV197320N04/04/1 Carrying Case for Gaming Console – Blue

Mad Catz Fold-N-Hold PlayCase NOV197320N03/04/1 Carrying Case for Gam $19.99 Mad Catz Fold-N-Hold PlayCase NOV197320N03/04/1 Carrying Case for Gaming Console – Red

Toshiba PA1452U-1BS6 Carrying Case (Backpack) for 16 Notebook – Blac $0 Toshiba PA1452U-1BS6 Carrying Case (Backpack) for 16″ Notebook – Black, Blue

Lenovo Carrying Case for 13 Ultrabook $30.99 Lenovo Carrying Case for 13″ Ultrabook

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Optoma Carrying Case for Projector – Gray $39.99 Optoma Carrying Case for Projector – Gray

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Samsung Carrying Case for Tablet PC $71.99 Samsung Carrying Case for Tablet PC