15-inch
Pocket size - 14.75" W x 10.5" H
Width: 14.13 inches (35.89 cm)
Depth: 9.73 inches (24.71 cm)

Fits:
15-inch MacBook Pro
Lenovo Think Pad
Dell Latitude
HP Spectre 
HP Stream
Lenovo Yoga 3 Pro

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13-inch
Pocket size - 13.12" W x 9.5" H
Width: 12.35 inches (31.4 cm)
Depth: 8.62 inches (21.9 cm)

Fits:
13-inch MacBook Pro
13-inch MacBook Air
Surface pro 3
Dell XPS 13
Asus Zenbook
Toshiba 2
Google chromebook
Acer Aspire S7

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12-inch
Pocket size - 11.5" W x 8"
Width: 11.04 inches (28.05 cm)
Depth: 7.74 inches (19.65 cm)

Fits:
12-inch MacBook 
Lenovo Mix 2
Acer Aspire Switch

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11-inch
Pocket size - 12.12" W x 8.5 H
Width: 11.8 inches (30 cm)
Depth: 7.56 inches (19.2 cm)

Fits:
11-inch MacBook Air
Surface 3
Asus Transformer
HP Stream 11