Camelbak reservoir drying hook (Q53355)

Camelbak charge ten English pounds for a piece of plastic to hang the bladder and keep it open for drying. This thing does the same job, but you can probably laser cut it for about a tenth the price. The square notches wedge in the opening of the reservoir. Tested in 3mm acrylic and it works fine, but 5mm would probably stay in place even more easily.