A little exposition for posterity: tefillin battim (the boxes) are available in three broad sizes. The most common is about 3-3.5cm square, while Chabad usually sticks to ~4cm. The third and least common size runs about 25-28mm square, and is often advertised as for use when traveling, or if your of the mind to wear two sets simultaneously (to settle the Rashi/Rabbeinu Tam issue). They’re more compact, and weigh about 1/2 of the other, larger sizes.
Does anyone have experience using only the smaller-sized set? I’m considering upgrading my existing “normal” set, and the idea of maybe sizing down for use as the daily and for travel is attractive. Is there any reason not to? Something I haven’t thought of, or wouldn’t know unless I did?
submitted by /u/old-town-guy
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Source: Reditt
