mercalia, your photo reawakened the horror of me venturing out of my tent starkers for an early morning pee in full view of a crowded campsite. Unfortunately it was a case of "I've started so I'll finish"! All caused by a combination of misreading my watch while half asleep, a very gloomy overcast morning & unusually quiet neighbouring campers - I broke all records for packing up & getting out of there, hoping they saw me as some sort of eccentric naturist!
I've been camping regularly for 50+ years and latterly, as the need arose, searched extensively for the perfect pee bottle. Having read the various comments on this post, for those who are sufficiently confident to juggle a fragile plastic drinks bottle (& a funnel?) inside their tent, I'd say it's a risky business but each to their own...... It's certainly a popular choice to judge from the Scottish verges & ditches that I've cycled alongside.
However, if you're after a reusable container that's more user-friendly in every way, get hold of a Nalgene folding bottle while some are available. I've found it the best choice by far but always very hard to find in the UK (mine came from Germany which was at least cheaper than paying US shipping costs).
To reassure those who consider them a bit pricey, they seem to be made of several laminated layers, similar to the more widely available Platypus bottles and my folding Nalgenes are still going strong after nearly 10 years of constant use so have actually cost me just a tad over £2 a year to date. The price of the Nalgene offerings is broadly comparable to the equivalent capacity Platypus models, though I haven't found the Platys to be quite as durable and of course they only come with that narrow neck which is definitely an issue for this type of use......
I tour on a purpose-built machine not a BSO, so don't see the point of skimping on the little things that can so easily improve off-bike comfort in a tent.
(Once again, I've no connection with product or supplier, just a very impressed user.)