Peak bagging, also known as hill bagging, mountain bagging, Munro bagging or simply bagging, is an activity in which hikers, hillwalkers and mountaineers attempt to reach the summits of a collection of peaks, usually those above some height or prominence in a particular region, or having a particular feature.
Many climbing clubs around the world have created lists of peaks with various attributes, often used by peak-baggers. Two examples of such lists are Colorado's 54 fourteeners and New Hampshire's 48 four-thousand footers. See List of mountain lists for more.
The generally accepted convention for peak baggers to consider a peak summited is to reach its highest point by any route using only human power (e.g., hiking, climbing, skiing, biking). However, for some peak baggers, simply being present at the highest point is sufficient to check the summit off the list. This allows for driving to car-accessible summits and declaring the summit "climbed". Drive-ups are allowed by the U.S. State Highpointers club and by the County Highpointers club, whose members are collectively attempting to reach the highest point in all 3,142 U.S. counties.
Some peak baggers increase the challenge of summiting a list of peaks in various ways, such as by requiring a minimum vertical climb per peak, climbing within a time limit, climbing in different seasons (such as winter), or climbing the same peak multiple times by different routes.
Various organizations have adopted rules for what to do when a peak is on private land or otherwise inaccessible, whether off-road vehicles may be used, etc.
Peak bagging is distinguished from highpointing. In peak bagging, the targets are the peaks of mountains or hills, and the popular lists usually require that the target pass some threshold of elevation or prominence. In highpointing, the goal is only to reach the highest point in some geographic area (e.g. county, state, or country), whether or not it is a peak.