I've never really liked D&D encumbrance. It's a pain. The item weights in the various equipment tables are all over the place in terms of accuracy (i.e. - mostly inaccurate) and to make things worse, the rules on carrying capacity are ridiculously broken. In one place it reads "15 times Strength" which is so stupidly over blown that even in the text of the 5th edition rules it basically implies "Yeah, you can basically just ignore encumbrance." After that, there is an optional rule for using 5x Strength as a base for penalizing movement and such... but the math is just too fiddly and players will ignore it anyway.