Are the length dimensions for closed tight / sealed?

Tech Specs:

Material:

PVC free double-coated nylon 

Volume:

(2.5L) 165 cu in, (5L) 390 cu in, (10L) 656 cu in, (20L) 1310 cu in, (25L) 1525 cu in, (35L) 2135 cu in, (60L) 3661 cu in 

Dimensions:

[2.5 L] 4.5 x 12 in; [5 L] 6 x 15 in; [10 L] 7.5 x 17 in; [20 L] 9 x 21 in; [25 L] 7 x 25 in; [35 L] 10 x 28.5 in; [60 L] 10-16 x 35 in 

Closure:

roll-top 

Backpack Straps:

no 

Weight:

(2.5L) 1.6 oz, (5L) 2.2 oz, (10L) 2.7 oz, (20L) 3.8 oz, (25L) 4.1 oz, (35L) 5.4 oz, (60L) 7.7 oz 

Recommended Use:

rafting, backpacking, camping 

Manufacturer Warranty:

lifetime