Excuse me~ I have some question about the Large bags.

Why is the large size of bag much cheaper than the median one(same color)?
Is the larger one second hand? Or does it have some differences with the small one?

And it doesn't have the Tough-Tek Strap Pad(no-slip material), right?
(I mean this one http://www.timbuk2.com/tb2/products/accessories/strap-pads/strap-pad-toughtek)
So is the strap pad Ballistic like this? (http://www.timbuk2.com/tb2/products/accessories/strap-pads/strap-pad-ballistc)
Because I'm wondering that is it necessary to buy a new ballistic strap pad for this bag.

I'd like purchase three bags. Can I pay for credit card?

Thank you for replying my questions. *^-^*
Have a nice day~~

Tech Specs:

Material:

Ballistic nylon 

Bag Dimensions:

[S]14.5 x 9.75 x 5.25in (36.8 x 24.75 x 13.3cm); [M] 18.75 x 10.5 x 7.75in (47.6 x 26.7 x 20cm); [L] 22.5 x 12.5 x 8.5in (57 x 32 x 21.6cm) 

Laptop Pocket Dimensions:

[S] 11.6 x 8.9 x 1.5in (29.5 x 22.6 x 3.8cm); [M] 14.2 x 10 x 1.8in (36 x 25.4 x 4.6cm); [L] 16 x 11 x 2in (40.6 x 28 x 5cm) 

Shoulder Strap:

Yes 

Access Types:

Top 

Pockets:

[External] 1 front; [Internal] 3 organizer, 1 laptop 

Weight:

[S] 1lb 13oz (820g); [M] 2lb 1oz (950g); [L] 2lb 5oz (1040g) 

Recommended Use:

Commuting, travel, school 

Manufacturer Warranty:

Lifetime 

Country of Origin:

Albania