[h4n]

Those aren't the ones people use.
Hand warmers get way hotter then the one sold for shipping use.

Check on kensfish.com

They sell different hours at different prices.

Make sure you wrap your heat packs up. You never want a heat pack to touch what your shipping or you'll kill the it.

-Sent from my Samsung Note, a "Phablet"

 

[@[email protected]]

i advise against using heat packs 99% of the time.
the package normally isnt left outdoors in a blizzard, and you can cook whatever is in the box if you mess anything up in the packaging, or if the box is too small.

i have never used a heat pack with plants, and dont remember ever getting a single DOA plant (i did once have a very brittle stem that got tossed around bad and broken into 1" segments, but thats unrelated).

 

[ADJAquariums]

I've only ever recieved fish with heatpacks, never plants but then again i only recieved plants in the fall/summer, if you think they will freeze then have your customers wait on the shipping, if thats possible, other wise i say send it without heat packs, it's indoors most the time and mail/ups/fedex trucks are infact heated.