For PC's
Generally speaking this works...
12-14" PCs = Small Hamptons
Thinner 15.4" PCs that are under 1.3" thick (such as many HP, Dell, or Sony 15.4" laptops) = Medium Hamptons
Thicker 15.4" PCs that are over 1.3" thick (such as the IBM 15.4" laptops) = Large Hamptons
17" PC's = XL Hamptons
.... but as with any PC laptop it gets complicated since there's no standardization. Here is how to calculate it exactly. Because the laptop opening is a linear zipper, the gating factor is the zipper for putting in a 2D laptop. The calculation for the zipper opening clearance becomes this for example:
W + D must be less than or equal to 14.5" for a Small bag
W + D <= 15.5" for a Medium bag
W + D <= 16.5" for a Large bag
W + D <= 17.5" for XL bag
Clearance for the height is somewhat similar.
H + D <= 12" for a Small bag
H + D <= 13" for a Medium bag
H + D <= 14" for a Large bag
H + D <= 14" for a XL bag
For example, a laptop may have these dimensions : 14.1"W x 10.5" H x 1.5"D.
a. Zipper clearance 14.1 + 1.5 = 15.6 therefore it clears only a Large or XL
b. Height clearance 10 + 1.5 = 11.5 clears the small and larger, but the zipper clearance requires Large or XL.
For Mac's
13" Macbook = Small Hamptons
15" Macbook Pro = Medium Hamptons
17" Macbook Pro = Large Hamptons
... but remember to take out the snugfit adjusters (velcro padded strips inside the compartment) on the Medium and Large size bags. These were meant for folks who want to carry a smaller laptop in a larger bag.
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