在夏天到来之前在考虑升级我的徒步装备。正在纠结是换一个更轻的40L背包，还是先投资一双更好的登山靴。预算现在只够买一样。对于做过多日徒步的人来说，哪种升级带来的差别最大？
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Thinking about upgrading my hiking setup before summer. Torn between a lighter 40L pack or investing in better boots first. Budget only covers one right now. For those who’ve done multi-day treks, which upgrade made the biggest difference?