(A selection of day packs from 25 litre to 45 litre.) The two questions, “What size of pack do I need?” and “What features should I look for in a new hiking pack?”, come up time and again during discussions with our clients on our Mountain Skills Courses. Here I try to explain some of the more important features of day packs, (and one or two of the more frivolous ones.) Size – This is possibly the most important consideration when choosing a hiking pack.  Pack size is measured in litres, and denotes the volume of the pack.  Mountain runners might