Pack Weight Analyzer装备重量分析器
Base, worn and consumable weight, percent of body weight, category donut and shakedown flags. 自动拆分基重、穿着重与消耗品，计算占体重百分比，附分类环形图与减重提示。
How the pack weight analyzer works
Backpackers argue about ounces because ounces turn into knee pain, blisters and slower miles. The analyzer turns a pile of gear into the same weight language used by long-distance hikers and the outdoor industry.
The skin-out accounting system
Every item is weighed in grams and assigned a status. Base weight is the gear carried in the pack that comes home — pack, shelter, sleep system, kitchen, spare layers and small essentials — with everything consumed removed. Worn weight is clothing and gear on the body at the trailhead (hiking clothes, boots, hat, poles carried in the hands). Consumables are food, water and fuel, which literally vanish along the route. The arithmetic is deliberately simple:
total skin-out = base + worn + consumables
base = Σ carried items (excluding worn & consumables)
This separation is why base weight is comparable between a two-day overnight and a five-day thru-hike section: only consumables change with itinerary length.
Grades and the body-weight ratio
Base-weight bands follow common long-distance usage: under 10 lb (4.54 kg) is ultralight, 10–20 lb (4.54–9.07 kg) is lightweight, and above 20 lb (9.07 kg) is traditional. Separately the tool computes:
load ratio = total skin-out ÷ body weight × 100%
A ratio over 20% raises a caution flag; over 25% it flags danger for rugged terrain or big mileage. Loaded- march studies and pack-fit guidance converge near that zone — fit and training help, but they do not repeal the physics of every step lifting the same mass.
The category donut and shakedown logic
Base weight is split into six categories (shelter, sleep, pack, kitchen, clothing, misc) and drawn as a conic-gradient donut so the heaviest target is obvious. Most traditional kits lose their first kilograms in the same order: share a tent or move to a tarp-compatible shelter, replace the 2 kg pack after the load shrinks, shrink the kitchen to one pot and one stove, and apply the layered-clothing system instead of “just in case” extras. The sample kit and JSON export exist so the list survives between trips: re-weigh when gear changes, print for a shakedown weekend, and keep safety items — navigation, insulation, first aid and signalling — even while chasing the ultralight line.
计算原理
背包客计较每一克，因为克重最终变成膝痛、水疱和变慢的配速。本分析器把一堆装备换算成长距离徒步者与户外行业通用的重量语言。
全装（skin-out）记账法
每件物品以克称重并标记状态。基重（base weight）指包里会带回家的装备：背包、宿营、睡眠、炊具、备用衣物与小件必备品，不含会被消耗掉的东西。穿着重量是出发时穿在身上的衣物装备（徒步衣、鞋、帽子、手持登山杖）。消耗品是沿途消失的食物、水与燃料。算法刻意保持简单：
全装总重 = 基重 + 穿着 + 消耗品
基重 = Σ 背负物品（不含穿着与消耗品）
正因为这样拆分，基重才能在两天过夜与五天长线之间直接比较——行程长度改变的只有消耗品。
分级与体重占比
基重分级采用长线徒步通行口径：低于 10 磅（4.54 kg）为超轻，10–20 磅（4.54–9.07 kg）为轻量，高于 20 磅（9.07 kg）为传统。同时计算：
负重占比 = 全装总重 ÷ 体重 × 100%
占比超过 20% 给出谨慎提示，超过 25% 对崎岖地形或长里程标记为高风险。负重行军研究与背包适配指南都指向同一区间——贴合与训练有帮助，但每一步都要抬起同样质量这一物理规律不会改变。
分类环形图与减重逻辑
基重按六类（宿营、睡眠、背包、炊具、衣物、杂项）拆成 conic-gradient 环形图，最重的目标一目了然。传统套装最初几公斤通常按同样顺序消失：拼帐或改用天幕系统；负重下降后再把 2 kg 的重装包换成轻量包；厨房精简为一锅一炉；用分层穿衣法替代“以防万一”的衣物。示例装备与 JSON 导出让清单能跨行程复用：装备变动就重新称重，减重演练周末可打印核对；同时即使追求超轻，也必须保留导航、保暖、急救与求救等安全装备。