If you make your own sleeping bag out of canvas or sacking, remember
two points: first, to have its flaps about a yard longer than
yourself, so that you can get well into it in case of rain, and
secondly: that to keep warm and dry you want more thickness underneath
than above you.
[Illustration: A COMFORTABLE SLEEPING BAG.]
The best way is to have a double sheet under you, or, in other words,
make your sleeping bag a double one; you can then fill the lower part
with straw, and sleep yourself in the upper compartment.
The object of having long flaps is seen in the illustration. The lower
one can be rolled with your spare clothes inside it to form your
pillow, while the upper one can be supported by a crossbar to form a
little roof over your head. In a sleeping bag of this kind, if
waterproof, you can sleep out without a tent at all.
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