Make sure the pack fits properly and its size is suitable for the wearer's body.

确保背包尺寸合适，大小和使用者的体型相符。

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Courchamp investigated this awkward trade-off by modelling how the costs of a babysitter change with decreasing pack size.

顾尚通过模拟随着狗群的减小看护狗的代价的变化研究这种两难境地。

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It was the size of a pack of cigarettes, gleaming in white and polished stainless steel and ready to swallow hundreds of songs.

它有香烟盒大小，白色精制的不锈钢熠熠发光，随时准备吞下几百首歌曲。

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Before my serendipitous encounter, I had my eye on the Motorola 89442N Universal External Cell Phone Battery, a pack about the size of a phone with a bantam micro-USB arm.

ENGADGET: IRL: Rayovac Mobile Power Pack, a TomTom car charger and cleaning a DSLR sensor

Ting Xu, a professor at the University of California, Berkeley and Thomas Russell, a professor at the University of Massachusetts at Amherst, have created a technique that could, theoretically, pack a disk the size of a quarter with 10.5 terabits (more than 10 trillion bits) of data, the equivalent of 250 DVDs.

FORBES: Magazine Article

The M500 is right about in the middle of the pack for size and weight.

ENGADGET: Review of Motorola's 5GB M500 MP3 player